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Roof sheathing

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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.
S
Sash is the moveable part of a window frame in which panes of glass are set in a window or door.

~ " 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 ~ is applied depends upon the type of roofing material. Roof boards may vary from tongue-and-groove lumber to plywood panels.
Dormer
The term "dormer window" is applied to all windows in the roof of a building, whatever their size or shape.

~ prepares your roof prior to the installation of shingles. Sheathing also serves as added protection against wind, rain, snow and ultraviolet sun rays.

~: 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.
S ...

The ~ 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.

The curb is set on the ~ 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 ~ 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 ~ and soffits.
Floor Plan
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 ~.
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 ~, 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 ~ provide suitable support for the building.

The weak link in most existing houses is in the connection of the ~ 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 ~. 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 ~, and other necessary items.

Okay, guys, a little ~. 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 ~
36"-wide rolled mineral roofing (or any other roofing material, including shingles or galvanized-steel sheeting)
Electric drill
200 2-1/2" deck screws
Screwdriver
Level
Carpenter's square
Jigsaw ...

Flashing
Weatherproof material installed between ~ (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 ~. 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 ...

DRIP EDGE: A piece of metal placed over the ~ 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.

The ~ 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.

Fly rafters- End rafters of the gable overhang supported by ~ 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 ~ to the rafters or trusses with the intent of greatly increasing the uplift strength of the entire roof structure.

Fly Rafters: End rafters of the gable overhang supported by ~ 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.

Baffles - Device to help achieve a ventilation space between insulation and ~. 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.

Step 2. Next, look for any nails driven through the side flashing into the ~ below. If you find nails, be sure to pull them. These nails are another likely source of leaks.

2. ¼-inch plywood for ~
3. Molded pre-hung door
4. Door lockset ...

Severe wood rot has decimated the roof rafter and the plywood ~. 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 ~.
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 ~. 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 ~ 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 ~. In some cases, you may see a pinpoint of ...
How to Enlarge a Hole in a Marble Counter ...

Purchase light colored roofing to reduce heat gain, and install a radiant barrier on the underside of the ~. Doing so minimizes heat gain in the summer.

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 ~ to leave an air gap before installing batts.

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 ~.

Remove all the felt paper, staples and nails in the area. Then place a chalk line down the ~ 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.

Design without parapets with this guide for using gypsum board as a roofing substrate to protect combustible ~ 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: See also: What is the meaning of Sheathing, Roof, Home, Roofing, House?

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