Minimum roof pitch shed dormer,garden sheds for sale harrogate tn,j shed swansea rent - Videos Download

19.07.2015
To help mark your rafters like mtndon is explaining you can pull a string from your high wall top plate to your low wall top plate (following the same plane as the bottom edge of the rafter in his picture)From that string you can measure up to the top of the plate and transfer those measurements to your rafter.
Yes, the idea is to build the walls and roof to have the weight act in a downward vertical manner. I don't think bevelling the upper top plate will affect the forces placed on the walls or cause them to bow outwards. I would agree that at a steeper angle there could be an increased risk of heavy loading on the roof causing problems with downward loading on the walls, plus as the angle increased there may be a danger from high winds pushing against the roof and causing trouble as well.
Quoting: bldginsp Not a good idea to use an engineered design out of the context of its original engineering, unless you know exactly what you are doing. I agree- the only advantage to a low pitch is ease of construction and less building materials, but in all other respects it causes problems. UNDERLAYMENT REQUIREMENTS on ROOFS - home - CONTENTS: what are the requirements for roofing felt or roof underlayment & what are the installation specifications for roofing felt?
This article series discusses roofing felt, specifically addressing the roofing code or roofing manufacturer's requirements for use of an underlayment, such as roofing felt, tarpaper, or other underlayment products beneath asphalt shingles and other roofing materials.
Our photo (page top) shows felt underlayment in good condition as a worn out roof was being stripped. Is Roofing Felt Underlayment Needed Under Roof Shingles, Tiles, Slate, Wood Shingles or Shakes?
It provides an extra weather barrier in case of blowoff's or water penetration through the roofing or flashings.
It is usually required for the UL fire rating to apply (since shingles are usually tested with underlayment). Our photo (left) shows new felt underlayment in place during an asphalt shingle roof installation in New York. While the requirement for felt underlayment beneath asphalt roof shingles seems to be a topic of almost timeless argument subject to much arm-waving and little reading of manufacturer's instructions and warranties, various sources recommend or require installation of a felt underlayment over the roof deck before asphalt roof shingles are installed. Booth & Roberts and other sources also report that underlayment is required or recommended below shingles.
Our photo above illustrates several details of roof drip edge, eaves flashing, and gable end flashing at an asphalt-shingle re-roof job we documented in Dutchess County, New York. Orange arrow: points to the installation of ice and water shield along the lower roof eaves - protecting against ice dam leaks that are common on un-vented roofs in cold-weather or snow-climates. Install the ice and water shield membrane so that it laps securely over and bonds to the surface of the drip edge. Watch out: if the roof is not using peel-and-stick eaves flashing membrane (ice and water shield), you will use roofing felt in this location.
Brown arrow: points to the first shingle course, doubtless installed as a reference point for this roof job. I prefer to install the gable drip edge under the felt though that detail is less critical than at the lower roof edge or eaves.
2) Asphalt shingles on less than 2:12 pitch, builder says ice&water shield under it, I know that's not OK but again any reference source you may know of? But a reading of roof shingle manufacturer's specifications for using an underlayment (and the article above which is nicely researched) does not find any exceptions that allow leaving out some of the coverage area.
I'd excuse the omission of felt at the eaves and at rake edges of a roof IF instead the roofer is installing a stick-down impermeable barrier such as ice and water shield. A Building Sciences Corporation report [at the citations section of this article] lso elaborates the usefulness of placing a vapor barrier on the roof deck below shingles in hot humid climates. In cool or temperate climates this does not present a problem because the combination of heavy wetting from due or rain i snot combined with solar heating at high outdoor temperatures, say the authors who go on to argue that that buckled roof shingles observed in the morning (caused by moisture migrating back up from the roof deck) relax during the day. But in un-vented roofs in hot humid climates, the authors argue that water from the roof surface is drawn upwards in liquid form, by capillary action, between plies of overlapped shingle courses where it passes ultimately through the vapor barrier and through the roof decking to the roof cavity interior.
The driving force of moisture through the roof and into the building is by solar heating according to the authors. The conclusion of the BSC report is an argument for installation of an impermeable moisture barrier underneath roof shingles, perhaps in place of the traditional and permeable roofing felt. How does the impermeable moisture barrier under roof remain impermeable when perforated by shingle nails or staples?
Roofing-felt as usually made consists of two or more, usually three, layers of felt-paper which have been separately saturated with with coal-tar pitch and pressed together. To prevent this adherence of the superposed couvolutions, various expedients have been devised for preventing their contact, such as rolling up a web of Manila paper with the roofing-felt, or sprinkling upon the felt some absorbent powder which is rolled up with it. To this end I make the .felt with a dry outer surface, containing only enough tar or pitch to make it waterproof or weather-proof, and confine the heavier or cementing coating of tar or pitch to the interior of the felt-between the surfaces which entirely to the edge of the fabric, but by preference I leave the layers uncemented along each edge, so that the pitch cannot ooze out at the edges of the fabric and cause the confelt made according to my invention. Abstract excerpt: An object of my invention is to provide a slate -roof structure wherein the slate units in each course are laid to expose relatively large areas to the weather so as to p rovide coverage for a relatively large roof area with a relatively small amount of slate, thereby reducing the cost of the roof as well as the load of the slate coverage. For roof slopes of four units vertical in 12 units horizontal (33-percent slope) or greater, underlayment shall be a minimum of one layer of underlayment felt applied shingle fashion, parallel to, and starting from the eaves and lapped 2 inches (51 mm), fastened only as necessary to hold in place. According to my invention and to meet the object thus specified, I provide a multiply sheet formed of layers of paper felt and asbestos, the fibers of the several layers being intermingled and adherent, so 25 that the sheet is an integral structure. In the manufacture of this sheet, the paper felt la er a is formed of cotton and wool or 0t er suitable fiber in the usual manner, into a wet pulpy web,,upon which is deposited a wet pulpy web of asbestos fiber b.
It is quite apparent that the sheet may consist of more than two layers of the asbestos and of the Wool fiber, as for instance the layer of asbestos can be laid between the layers of Wool felt, or vice versa. After the sheet has been dried into a porous absorbent condition, it then may be saturated with asphalt or any other of the usual waterproofing compositions which are employed in the manufacture of prepared roofings, and then faced, preferably on the wool-felt side, with a layer of high-meltingpoint asphalt or .pitch a, as shown in Figure Renewed November 14, 1919. It has been proposed to cement together, as by the use of pitch, sodium silicate, or the like, a layer of asbestos upon a layer of roofing felt, but this increases the cost of production of the roofing material. According to my invention, I provide a single integral sheet, in which the strength is afforded by the felt layer, and the fireproof qualities of the asbestos layer.
It is unnecessary herein to describe the operations by which the raw material, cotton ,or wool rags, or the asbestos, are disintegrated and reduced to awet fibrous pulp, or the machines by which they are formed into webs 01'' layers, as the same are well known. If desired, the sheet may have only the felt layer saturated or coated, or both, with a waterproofing or non-heat-conducting compound, or the asbestos layer may be saturated or coated, or both, in either instance leaving the other layer untreated, this being of course subject to particular requirements. While the composite sheet as herein described is particularly applicable for use in the manufacture of flexible waterproof roofing, yet its use is not confined thereto, as it may be employed for a variety of other uses.
For some purposes, the sheet may be so treated as to saturate with a waterproofing or non-heat-conducting compound only the fibrous layer, leaving the asbestos layer unsaturated, or vice versa.
What I claim is The herein described method of producing-a flexible composite sheet of fibrous material, consisting in bringing into face contact two layers of wet pulpy felted fiber and asbestos fiber, causing the said fibers of said layers to interlock, and then drying the sheet thus formed.
Continue reading at ROOFING UNDERLAYMENT BEST PRACTICES or select a topic from the More Reading links or topic ARTICLE INDEX shown below. Question: did omission of felt underlayment contribute to shingle blow-off in windy conditions?
I have encountered a roof with absolutely no felt in what way did this contribute to the seal of the roofing if any? Mike, the article above quotes authoritative sources on why we want felt below asphalt shingles on a roof.


On the other hand, the omission of felt underlayment may increase the roof leaks that occur during a storm when shingles blow off of the roof. I am looking for a board which is between 10-12mm thick to be used as an under layer material for the Shingles.
Kindly advice on whether we can get a material which can be nailed on the roof and if possible it should be waterproof. No particular problem except if you leave a mess or old half-driven nails or old rippled, torn or folded felt you may have a rough surface that punctures new felt and shingles or causes the new roof not to lie flat.
It is common to install three or even more shingle roofs atop the original roof sheathing without worrying that the sheating has been damaged by prior nails. We just started manufacturing roofing underlayment in india and we are trying to find dealers on north America who can market this product. Please advice or comment over how to go ahead or can some one be bridge between us and end users. I've installed a design that placed foam insulating board atop rafters, followed by plywood, then roofing; we left an air space between the plywood deck underside and the top of insulation placed between the rafters in an effort to obtain a very high-R roof. If you don't want to disturb the interior finished ceiling you indeed have to insulate from above. In my opinion the caulking of the upper edge of step flashing, if the design requires that sealant use, is certainly part of installing the step flashing itself, not a separate job. He's got a point that it is difficult to install ice and water shield under existing flashing. My house has a concrete tile roof where the tiles were nailed directly to the spaced sawn wood stripping that is nailed to the roof rafters. Sam you don't say where you live - as concrete roof tile installation requirements or specs vary by jurisdiction.
At any event, there is no cost-reasonable way to add felt below the existing concrete tile roof.
If your local building codes require following the manufacturer's installation instructions then underlayment is probably requried where you live. NRCA Roofing & Waterproofing Manual, 5th Edition, National Roofing Contractors Association, 10255 W.
Our recommended books about building & mechanical systems design, inspection, problem diagnosis, and repair, and about indoor environment and IAQ testing, diagnosis, and cleanup are at the InspectAPedia Bookstore.
This clay roof tile guide considers the various types of tiles, slates, and roofing materials on the marketA as well asA their uses, how to estimate the required quantities, and where to buy them. The author, Kevin Taylor, works for the National Federation of Roofing Contractors as a technical manager presenting technical advice and providing education and training for young roofers. 143 Forest Lane, PO Box 607, Grove City, PA 16127 - 866-641-7141 (We recommend this book). Solar heating, radiative cooling and thermal movement: Their effects on built-up roofing (United States. The Illustrated Home illustrates construction details and building components, a reference for owners & inspectors. You can look at the construction process used by this websites moderator which is listed by headers on the left of the main page for how to build the roof. You'd have to do that with a table saw, but this would require the least amount of calculating and cutting in the long run since all the studs would be cut at a regular 90 degree angle, and you could then just lay the rafters on top of the beveled upper top plate before fastening them down with hurricane ties. If the top plates are slanted there is a sideways moment that is being promoted and only restrained by the mechanical fasteners. The rafter being nailed to the opposing walls (plus hurricane straps) will tie it all together sufficiently and be more than strong enough. I also think that in a remote build situation trying to bevel a 2x4 along its width would be harder than a birds mouth to accomplish, but maybe it's 50-50. And, with a gable, you can have a loft, which though small, may be large enough to sleep someone or give you storage. We simply doubled or tripled up some cripple studs in the outside walls and set the beam on them.
Moderate to steep gable would stand a chance of shedding the snow load rather than providing a place for snow to accumulate. It looks as if the installer of asphalt roof shingles (still visible at below right but now worn out) may have placed roofing felt on top of a still older wood-shingle roof. A special underlayment may be recommended by the manufacturers of specific roofing product and hybrid products. The membrane does not have to extend fully to the outer edge of the drip edge flashing, but it should be on top of the upper surface of the drip edge in a best-practices roofing installation.
In that installtion the lower edge of the felt must be on top of, not underneath the drip edge. The lower edge of the felt is overlapped 3-4" on top of and over the upper edge of the lower course of ice and water shield. Longer overlaps of asphalt shingles past the drip edge will hang over into the gutter, will send roof runoff off of the roof rather than into the gutter, and will eventually crack, break, and look gross. 15 asphalt-saturated underlayment be used with roofs having slopes of 4:12 (18 degrees) or greater. But on an un-vented roof moisture driven inwards [through the shingles, roofing felt, and OSB or plywood roof decking] in hot humid climates, needs to be addressed. What will be the market effects of suggesting entire roofs be underlaid first with a moisture barrier unaffected by roof shingle fasteners such as ice and water shield? These precautions are somewhat effective, but entail considerable expense and annoyance both in the manufacture and use of the felt. Roofing felt or equivalent material underlies each course of slate for cushioning purposes in addition to providing an effective seal against the entrance of moisture.
One or more layers of felt, sheathing paper, nonbituminous saturated felt or other approved material over which a steep-slope roof covering is applied.
Apply a minimum 19-inch strip or underlayment felt parallel to and starting at the eaves, fastened sufficiently to hold in place.
Starting at the eave, a 19-inch (483 mm) strip of underlayment shall be applied parallel with the eave and fastened sufficiently in place. Starting at the eave, 36-inch-wide (914 mm) strips of underlayment felt shall be applied overlapping successive sheets 19 inches (483 mm) and fastened sufficiently in place. These'may be then subjected to a felting action in a machine or apparatus of the ordinary construction, or be dried in the usual dryin machine, thus producing a sheet, one face of which is paper felt (so-called) and the other face of which is asbestos, the two layers being interlocked I together by the intermingling of their fibers without the use of any foreign binder or cement. Sheet asbestos, when sufiiciently thin to be used alone, does not possess the necessary tensile strength, whereas wool felt alone, while relatively slow-burning when impregnated as described, does not really possess the desirable fireproof qualities.
For instance, but without limitation, the sheet may be'employed for the purpose of insulation, or as a flooring, or for other purposes. But I haven not found any reference to a connection between shingle blow-off and the absence of felt.
The structure is reinforced 2X6 so I am not as concerned about the weight, as I am the underlayment.


It seemed to me to have been a waste to place that uppermost layer of foam insulating board.
Usually roof flashing installation is part of roof installation, though there could be exceptions such as when a roof penetration is installed *after* the roof has been installed.
I asked the roofer if we should install ice & shield around my skylights but he said it's not necessary as he doesn't think it's a good idea to remove the skylight flashing. Booth, Keith Roberts, Proceedings of the North American Conference on Roofing Technology, p.
All rights and contents are ©Journal of Light Construction and may not be reproduced in any form. You cut two bird's mouths in the rafter, one for the upper end and one for the lower end. You also wouldn't need to cut any birds mouths in every rafter, just lay them on top of the walls and toenail nail them down. It is very easy to cut all the birds mouths in the rafters all at once by ganging them together and cross cutting notches with a circ saw.
But if someone out in the middle of nowhere tried a beveled top plate on a steeper pitch and didn't know what they were doing, they could make some serious problems for themselves.
Problem is if you do heat it in winter there is a very good chance that will cause melting and then icing. Ice dams can be a problem if you do have snow melting occur from either heat escaping through the roof, or you have a very warm patch of weather in between two cold periods. Above is a peel-and-stick mineral surfaced roofing underlayment shown during installation of a metal standing seam roof.
Drip edge flashing directs roof runoff away from the roof fascia and edge and into gutters or at least not down the fascia board (if no gutters are installed) and it is recommended by roofing standards, manufacturers, and experts.
Otherwise as we repeat just below, some water is going to run under the drip edge rather than be directed off of the roof surface.
That is, the drip edge flashing is the first item installed onto the roof sheathing (or atop old shingles in a multi-layer shingle re-roof job). I once had a written opinion from NRCA stating felt needed all the way to the eaves but can't find it anymore.
They are then passed between pressure-rolls to press them together and squeeze out the excess of pitch, and they are then cooled and dried, and finally wound up in a 'compact roll for the market. I also provide novel means for rendering splices between adjoining strips of roong felt moisture-proof to the end that the roof structure may have moisture-proofed properties throughout in addition to permitting the use of strip material of shorter lengths than the width of the roof.
Starting at the eave, apply 35-inch-wide sheets of underlayment overlapping successive sheets 19 inches and fastened sufficiently to hold in place. ALso that will allow an actual inspection of the roof decking or sheathing - any rotted or damaged sections should be replaced.
I found the roof had metal hat channel screwed to the skip sheathing and a heavy paper, almost cardboard type underlayment between the hat channel and concrete.
However there has been more recent research on the effects of and benefits of heat transmission through top-insulated roofs. Then proper flashing should be part of the installation of whatever that subsequent thing was - a chimney, plumbing vent, etc.
He said the ice & shield goes under the flashing and he's reluctant to replace the current skylight flashing since it is not leaking.
Since a beveled top plate is not level, in extreme circumstances downward force on the plate from the roof will force the wall outward. If the weight of the snow stays on for a long time, even if the rafters are rated for it, they gradually suffer from the weight and can sag.
This made us feel more comfortable with the potential snow load and the cost was minimal for the piece of mind given. If you install the drip edge on top of the felt, any condensation or water running down the roof surface between shingles and felt will run underneath the drip edge, down the fascia, and perhaps into the building soffit or walls - not a nice thing. As all the layers are coated with the pitch, the contacting convolutions in the roll are liable to adhere together, particularly in warm weather when the pitch is [softened] by the heat, and when this occurs the material becomes practically valueless, because of the impossibility of unrolling it. I saw no battens supporting the tiles and all the fastener at the ridge and valleys were exposed screws. The text covers moisture needs, heat tolerance, hardiness, bloom color, foliage characteristics, and height of 350 species and cultivars. Use H1 hurricane ties on each to make it easier to do and stronger.Build the two walls and set them plumb. Best to keep all forces going straight down to keep all your forces geometry simple and plumb. If Josh8880 is out in the middle of nowhere or doesn't have a lot of building experience, the least amount of calculating, measuring and cutting possible is probably his best and easiest choice. There are good reasons to stick with the program with conventional framing, it is the culmination of over a century of trial and error, and wisdom from others much smarter than me and the few of us.
But ice dam issues are more likely with any roofing on low pitch, so more and better underlayment is wise. After you sheath the roof put 4 inch strips of peel and stick membrane about 16 inches apart across the roof (like vertical stripes running from the high side down to the low side). Other roofers I received quotes from said I should install ice&shield and new flashing around skylights. Some quotes from a variety of roofers are saying we don't need a membrane under the new shingles. Galow specializes in residential construction including both new homes and repairs, renovations, and additions.
Thanks to Alan Carson and Bob Dunlop, for permission for InspectAPedia to use text excerpts from The Home Reference Book & illustrations from The Illustrated Home. Mark the locations of the peel and stick pieces on the eave boards and then cover the entire roof with a layer of heavy building paper. We feel the current problem we are all having is because there is NO underlay or membrane on the roofs. Carson Dunlop Associates' provides extensive home inspection education and report writing material.
If the sun shines and then the snow forms a frozen crust it won't even blow off in a good wind. As I suggested before, peel and stick underlayment over the whole roof may protect the roof plywood from occasional water climbing under the roofing.
I actually did a trigonometry refresher and then did the math old school on paper with a pencil.
I want this cheating roofer to install new plywood as punishment for being a thief.Pleas,e help me with yor answers.



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