using a pitch-measuring tool that id made, we also determined that the exact pitch of the shed roof was 3 1/2-in-12. blind valleys simplify framing to keep the porch roof framing as simple as possible, we installed a structural ridge supported by posts at each end, with the common rafters landing on top of the ridge.
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.
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.
deck foundation: using deck supports, which are adjustable in both height and pitch, for the foundation. deck joists: notching posts to fit deck band joists for added support. composite decking: installing tongue and groove composite decking with hidden fasteners.
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.
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.
just rib out the osb, rip some lengths of spruce 2x4 or 2x6 to give you the slope you want. just make these tapered cuts so that the minimum thickness is approximately 1'. nail and construction adhesive glue them to the tops of the existing joists and then put new a new subfloor and a rolled asphalt roof on top.
walkable, pvc sheet membranes for flat roof decks. a waterproof membrane and a pedestrian traffic coating in one product solution can be the most cost effective way to turn a flat roof into a low-maintenance leisure deck area.
contributing editor scott mcbride responds: the easiest and least-expensive way to roof over a flat, sheathed deck is to use double-coverage roll roofing. but first, the roof deck should be built with some pitch away from the houseat least 1/4 in. per ft. manufacturers of roll roofing recommend
but first, the roof deck should be built with some pitch away from the houseat least 1/4 in. per ft. manufacturers of roll roofing recommend at least 1 in. per ft. for double-coverage roll roofing, though ive seen dead-flat rolled roofs that remained tight for many years. the roofing is 3 ft. wide by 36 ft.
the blocking is held low, to hide the roof/wall intersection and to provide a 1 inch air space at the top for a ventilation channel. at the beam end, the rafters are fastened with a 10 inch structural screw through the top of the rafter into the beam. the roof deck is 1x6 attached to the top of the rafters with 1/4 inch space between boards.
how to build a roof. a roof is much more than just the decorative top of a building. a roof provides protection from the elements and precipitation, helps drain water away from a structure, and provides insulation that helps keep the interior of a building warm or cool, depending on the season.
the flat roof typifies modern and contemporary architecture, however a flat roof is prone to leak. the slope on a flat roof is too small to shed water, and the shallow slope tends to collect leaves and debris that act like dams. a sloped roof is more capable of removing water from the building's exterior, and can be an attractive alternative to
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ponding water issues. ideally your roof should have a positive slope, with a fairly flat surface no indents . it is optimal to have 1/4 per foot pitch on any flat roof. however, that isnt always the case. foundations settle, rafters bend, or door openings are too close to the roof surface to increase the slope.
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.
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.
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.
re: how to put roof over existing deck ho today become more and more creative how about hiring professionals john if you have no clue what you doing, instead of playing a guessing game with roof's, with loads, etc. even if we lay this out for you, you will not know what it means or how to apply it.
a gable roof, the most common, forms a triangular shape, projects along a ridge down the center of the deck and overhangs the enclosed space. this significantly sloped deck roof allows for proper drainage of rain and snow, as opposed to a flat roof.
issue 1: access. a deck on your roof is possible if you have handy and convenient access. to make the space usable and practical, a direct access route to the roof is required. nobody wants to have to climb a ladder to use a space, and carrying items up and down a ladder is ill advised.
however, over the last few decades new and advanced materials have been developed. they are highly durable, energy efficient and can compete with traditional roofs on longevity. here are three general types of systems you can put on a flat roof: 1. single - ply 2. built-up 3.
many times the flat roof does not have a proper pitch and the water just sits on it. if you are thinking about redoing your flat roof you should consider having the deck pitched to get the water
if you look here at the lower slope roof, you can see that we've already put panel on it and installed z trim as we have been doing elsewhere on this project. the piece that's going to allow us to join the panels on the lower slope and the panels on the higher slope is the pitch transition flashing or the pitch change trim.
step 2. determine the slope of the roof. roofs with a slope of 1 to 3 inches of fall to 12 inches of run should use rolled roofing. slopes above 3 inches fall to 12 inches run can use shingles. build a stud frame wall at the high end of the proposed roof structure. anchor the wall to the existing roof deck.
another option was to make a lean-to roof, covered in roll roofing. this would allow a lower pitch and keep the lowest point of the deck roof at least 7' high. the appearance, though, would not be good; the garage was to be redone with new shingles at the same time, and the difference between the two would have been striking.