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typical decks are designed to support 55 psf lbs per square foot . porch decks require 25 additional psf for roof loads for a total of 80 psf. as a result, most decks have inadequate footings to support a new porch roof. the footings for porch decks must be larger than deck footings. many porches use 22' diameter corner and intermediate footings.
adding pitch to a flat roof. the flat roof already has a slight pitch as it is required by law. various styles of a pitch roof can be built or you can purchase pre-manufactured trusses. you will need to ensure that you are in standards with your local building codes and have the permits required.
roofers pitching a flat roof with new decking and rolling out the base ply for a certainteed flintlastic commercial roof. flat roofs are a difficult and time consuming project to take on.
pitched roof. use prefabricated trusses to put a new pitch on the roof. give the width and length of the roof and a chosen pitch to a truss supplier to build trusses to order. use at least a 6/12 pitch, rising 6 inches per foot of slope, to provide attic storage; get special attic roof trusses to make a room inside the new roof.
match the roofing on the covered porch with the main roof. determine the minimum slope of the roof based on the roofing material. the minimum pitch for shingles is 1:6, which is equivalent to 4 inches rise to 24 inches run. the minimum pitch for a standing seam metal roof is 1:4, or 3 inches rise to 12 inches run.
further information. one of the challenges in building a deck on a roof like this thats unlevel is the deck needs to be level. now, unlike your backyard that may be unlevel when youre building a deck, you can set your post and adjust your framing nice and level. but here its a little bit more of a challenge.
next, you will need to install a watertight epmd rubber membrane over the top of the roof deck for protection against water infiltration in place of roofing materials. then, you will install sleepers or flat 2x6s laid flat every 16 on top of the roof surface. this will provide the surface for you to attach the decking.
i don't know of any current building code that allow a totally flat roof. 0 pitch even a so called flat roofs must have a min. pitch of 1/4' per foot. one simple way of doing this is to install pitched/beveled rigid insulation.
this wooden deck was built over her screen porch and on top of a flat roof. its not really flat: its pitched 1/4 inch per foot, but without a spirit level you cant really tell. years of neglect and lack of gutter coverage above the deck had destroyed not only the deck but a window and the sidewall as well.
roof slope. the slope of a roof, or 'pitch,' is determined by how many inches the roof rises over 1 foot or 12 inches. an example for a steep sloped roof is 8:12. this means that the rise of the slope goes up or down 8 inches for every 12 inches. to put it in perspective, the angle of this slope would be around 30 degrees.
avoid the hassles and issues associated with a flat roof by doing one thing work with the right roofing company. whether you need to install a new flat roof, replace, or fix a damaged one, choose professionals with your best interests in mind. look for a trusted company by going local. if youre from toronto on, hire a company in the same location.
according to the international building code, the typical built-up flat roof that uses tar or asphalt goes by the guideline that for every foot 12 inches of a flat roof, a minimum of ¼ inch must step up or down. this is the basis for calculating the angle, which is approximately a 1.19-degree slope.
here are three general types of systems you can put on a flat roof: 1. single ply 2. built-up 3. spray-on/paint-on. single-ply roofing. epdm ethylene propylene diene monomer , pvc polyvinyl chloride , and tpo thermoplastic olefin are the most popular single-ply membranes.
to get a definite pitch for runoff frank harding is ripping 18' 2x8's on a diagonal. just measure up 5' alternately from the top and bottom at both ends and snap a line. just cut down the center of line with the skillsaw to yield two identical tapered rafters.