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.
Roof Sheathing: The boards or sheet material fastened to the roof rafters on which the shingle or other roof covering is laid.
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.
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.
Roof sheathing " 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.
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?
Roof Sheathing Structural covering of boards or plywood placed over roof rafters; sheathing provides a structural base for the finish roof.
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.
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.
Cut a hole in the roof sheathing with a jigsaw or reciprocating saw. Drill a starter hole so you can insert the blade to begin the cut.
The curb is set on the roof sheathing around the perimeter of the opening, and the skylight is set on the curb.
Rafter Rafters are the structural members that support the roof sheathing to which the outer covering of the roof (shingles, etc.) is attached.
The fascia board forms a drip edge for rain water, as well as hides the end of the roof sheathing and soffits.
Floor Plan ...
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, ...
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.
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.
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.
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
Weatherproof material installed between roof sheathing (or wall sheathing) and the finish materials to help keep moisture away from the sheathing.
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.
Footing - A masonry section, usually concrete, in a rectangular form wider than the bottom of the foundation wall or pier it supports.
Sustainable Options for Roof Sheathing
The Purpose and Use of Roof Sheathing
How to Install Soffit Boards ...
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.
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.
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.
See also: Sheathing, Roof, Home, Shingle, Construction