FRT Plywood Roof Sheathing
This guide was produced to provide information regarding concerns associated with fire-retardant treated (FRT) plywood used for roof sheathing.
Roof Sheathing - The boards that provide the base for the finished roof.
Roofing - The wood, asphalt, or asbestos shingles - or tile, slate or metal - that form the outer protection against the weather.
Corner Bracing - Diagonal strips to keep the frame square and plumb.
Roof Sheathing: The boards or sheet material fastened to the roof rafters on which the shingle or other roof covering is laid.
Roof System: General term referring to the waterproof covering, roof insulation, vapor barrier, if used and roof deck as an entity.
ROOF SHEATHING - Plywood or similar sheets which are fastened to the roof rafters. Building paper is applied and then roof covering.
SAG - A dip or deflection in a joist, or an unevenness in a coat of paint.
SASH - The window frame that houses the glass pane.
Roof sheathing are boards or sheet material which are nailed to the top edges of trusses or rafters to tie the roof together and support the roofing material.
Sash is the moveable part of a window frame in which panes of glass are set in a window or door.
Roof sheathing or sheeting- The wood panels or sheet material fastened to the roof rafters or trusses on which the shingle or other roof covering is laid.
Roof valley - The "V" created where two sloping roofs meet.
The manner in which roof sheathing is applied depends upon the type of roofing material. Roof boards may vary from tongue-and-groove lumber to plywood panels.
The term "dormer window" is applied to all windows in the roof of a building, whatever their size or shape.
Roof sheathing prepares your roof prior to the installation of shingles. Sheathing also serves as added protection against wind, rain, snow and ultraviolet sun rays.
Roof sheathing: silver side down
Radiant-barrier sheathingby Andy Engel
Q & A: Why do Canadian carpenters still measure in feet and inches?
The roof deck is installed over the roof rafters and provides the surface for the application of the roofing shingles. The roof deck (sheathing) can be plywood, plank or hardboard.
Septic Recovery Area
That portion of the lot reserved for future septic system drain fields.
Sheets, usually of plywood, which are nailed to the top edges of trusses or rafters to tie the roof together and support the roofing material.
The roof sheathing is thicker than usual, 1 1/4", so the roofing nails don't show through to the inside. First we put on a 3/4" A-C grade plywood. This went on with the "A" side down since it's visible from inside. And then we put some oriented strand board (OSB) over that.
7) Add the roof sheathing to the overhang next. If you had to tear up the sheathing on the roof to install the rafter extensions, reinstall that sheathing first. Try to match the thickness of the sheathing on the overhang with the sheathing on the roof within about 1/8 inch.
Working with Roof Sheathing and Overhangs Sheathing roof is not as simple as placing a hat on your head. It should be properly placed so you can
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The curb is set on the roof sheathing around the perimeter of the opening, and the skylight is set on the curb.
The ceiling opening is framed in the same way as the roof opening-headers are nailed between the ceiling joists to support the existing framing.
Rafter Rafters are the structural members that support the roof sheathing to which the outer covering of the roof (shingles, etc.) is attached. Typically, rafters slope down from a central ridge or peak to the top plates of either two (gable roof) or all four (hip roof) of the exterior walls.
The fascia board forms a drip edge for rain water, as well as hides the end of the roof sheathing and soffits.
This drawing shows each floor of the house (main, second, etc.) and indicates the floor or ceiling joists above it or the recommended truss layout.
A minimum of 1 inch between the insulation and roof sheathing.
The requirements for proper attic ventilation may vary greatly, depending on the part of the United States in which a home or building is located, as well as the structure's conditions, such as exposure to the sun, ...
Big moisture problems can occur that can damage roof sheathing, rafters, and any finished wood products you might use on the ceiling if not applied properly. In addition to the ridge and soffit vents, you must use rafter space vents as well (unless you are using scissors trusses).
Frame installation must involve technical planning and calculations to ensure that the studs, joists, subflooring, rafters and roof sheathing provide suitable support for the building.
The weak link in most existing houses is in the connection of the roof sheathing to the rafters or roof trusses. There are several ways to strengthen this attachment. The cheapest and easiest is to renail or, better yet, screw down the sheathing when you replace your roof covering.
OSB is not my favorite material for roof sheathing. I would prefer plywood, but it costs about twice as much. One drawback of OSB is its tendency to swell when it gets wet. Wet OSB will rot faster than plywood under similar conditions.
Other logs, hauled down from the same mountains, were used to shape door and window frames, rafters and roof braces, pole-type roof sheathing, and other necessary items.
Okay, guys, a little roof sheathing. We're gonna be dried in in no time here. Now Christine, there's a little gauge I cut down there. You have to overhang about one inch no the front. You got it, okay. Hold it right there. Chris, you're perfect. You're perfect.
2 pieces 25" x 33" plywood (any thickness) to make roof sheathing
36"-wide rolled mineral roofing (or any other roofing material, including shingles or galvanized-steel sheeting)
200 2-1/2" deck screws
A space between roof insulation and roof sheathing for movement of air.
Coarse checking pattern characterized by a slipping of the new paint coating over the old coating to the extent that the old coating can be seen through the fissures.
Weatherproof material installed between roof sheathing (or wall sheathing) and the finish materials to help keep moisture away from the sheathing. Typically, sheet metal or a similar material is used in roof and wall construction to protect a building from water seepage.
The framing member which directly supports the roof sheathing. A rafter usually follows the angle of the roof, and may be a part of a roof truss (see diagram).
See also: Topics: Roof, Q&A: Roofs, Q&A: Framing
Rain Screens ...
The roof sheathing is applied the same as the walls and the floor. In the attic space, you will need to put a vent in so that there can be airflow to prevent moisture and mold, also to regulate temperatures directly under the roof.
DRIP EDGE: A piece of metal placed over the roof sheathing at the perimeter to deflect water away from the sheathing and fascia board.
EAVE: The lower part of a roof where it meets or projects over a wall.
Fly rafters- End rafters of the gable overhang supported by roof sheathing and lookouts.
Footer, footing- Continuous 8″ or 10″ thick concrete pad installed before and supports the foundation wall or monopost.
Hurricane roof adhesive seals the roof sheathing to the rafters or trusses with the intent of greatly increasing the uplift strength of the entire roof structure.
Baffles - Device to help achieve a ventilation space between insulation and roof sheathing. It helps assure air flow from the eave vents in attics and cathedral ceilings.
Ballast - A transformer that steps up the voltage in a florescent lamp.
Fly Rafters: End rafters of the gable overhang supported by roof sheathing and lookouts.
Folded Seam: In sheet metal work, a joint between sheets of metal wherein the edges of the sheets are crimped together and folded flat.
Rafter - (1) The framing member that directly supports the roof sheathing. A rafter usually follows the angle of the roof, and may be a part of a roof truss. (2) The supporting framing member immediately beneath the deck, sloping from the ridge to the wall plate.
Step 2. Next, look for any nails driven through the side flashing into the roof sheathing below. If you find nails, be sure to pull them. These nails are another likely source of leaks.
2. ¼-inch plywood for roof sheathing
3. Molded pre-hung door
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Severe wood rot has decimated the roof rafter and the plywood roof sheathing. You can see the white wood fungus growing on the underside of the plywood.
Wafer board - A manufactured wood panel made out of 1"- 2" wood chips and glue. Often used as a substitute for plywood in the exterior wall and roof sheathing.
Walk-Through- A final inspection of a home before "Closing" to look for and document problems that need to be corrected.
Rafter - The framing member which directly supports the roof sheathing. A rafter usually extends from the ridge or the hip of the roof to the eaves and may be a part of a roof truss.
In preparation, decide whether you will remove existing shingles and underlayment. If so, do this first and discard. Sweep and inspect your roof sheathing to ensure it's clear of debris and nailed down properly. Patch any gaps or delamination.
Patching a roof leak begins with locating the leak. Typically, leaks are in proximity to water marks on rafters or at the underside of the roof sheathing. In some cases, you may see a pinpoint of ...
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Purchase light colored roofing to reduce heat gain, and install a radiant barrier on the underside of the roof sheathing. Doing so minimizes heat gain in the summer.
Hot moist air lingering in the attic spaces can condense on the underside of the roof sheathing and rot it out and also causes mold to develop on the interior walls. Cold air in the attic space will not affect the temperature in the adjacent living spaces if properly insulated.
Kenny Grono Texas is a quite different climate from where I build, but it sounds like batt insulation with a vapor barrier would be inexpensive and effective here. If you have a ridge vent use baffles against the roof sheathing to leave an air gap before installing batts.
To guard against such seepage, apply self-adhesive waterproof underlayment ('ice barrier'), which adheres tightly to bare roof sheathing and seals around nails driven through it. Buy it at roofing supply companies or home centers.
On the other side of the A, the purlins supporting the roof sheathing are placed horizontally to serve double duty as shelves. Two daybeds offer additional storage, a kitchen wall features a sink and space for a mini fridge, and a micro loft has a hinged 'sunroof' for ventilation.
Oriented Strand Board (OSB, Chip Board, Wafer Board): A manufactured wood panel made out of 1"- 2" wood chips and glue. Often used as a substitute for plywood in the exterior wall and roof sheathing.
Remove all the felt paper, staples and nails in the area. Then place a chalk line down the roof sheathing on both sides of the ridge. Cut the sheathing out along that line and place your vent in your hole, over the peak. Finish by securing it in place.
Leave the coveralls in the attic when you come down for a break to avoid bringing dust and loose insulation fibers into the house's living area. Put down plywood or lumber to serve as a work surface. Be mindful of roofing nails poking through roof sheathing.
Resistance to heat flow depends on the heat flow direction, and these products are most effective in reducing downward heat flow. Typically used between roof rafters and floor joists, many products are designed for easy retrofitting. For new construction, products such as foil-faced roof sheathing ...
—Design without parapets with this guide for using gypsum board as a roofing substrate to protect combustible roof sheathing and coverings from interior fires.
GA-610-02, Fire Resistance Provided By Gypsum Board Membrane Protection by the Gypsum Association, Washington, DC, 2002.
See also: Sheathing, Roof, Home, Roofing, House