Laying Plywood Down For Roof

You can install the mesh over old roofing material or insulation.

Laying plywood down for roof.

Align the first metal roofing panel so that it overlaps the edging by 1 2 to 3 4 of an inch and is square to the roof. Most plywood underlayment is about 1 4 inch thick and has square edges and a smooth knot free top face. Florida dade county has prohibited the use of osb for roof decks because of the effects that hurricane andrew had on homes that used the material for roofing. That will suffice on a roof with rafters set 16 inches apart with minimal roof loads.

How to correctly install roof sheathing 03 18. All sheathing applied should be perpendicular to the rafters so that plywood sheets will meet in the center. Then use a utility knife or scissors to trim away the excess so the mesh fits tightly against the roof. Lay fiberglass mesh over the roof and cut it to length.

Loads will vary with the pitch of the roof. The connection between the roof sheathing and the structure is a vulnerable point that is known to fail during a hurricane. Lay waterproof felt material on the flat area of the roof. Be sure the larger edge is laid so that the small edge of the next panel will overlap it.

It typically comes in 4 x 8 foot sheets. While plywood dries down evenly osb tends to absorb moisture more around the edges making it swell and dry down with a ring around the edges. Install the roofing screws vertically along each rib in the panel. Spread the mesh pieces side by side overlapping them by about 3 8 in 0 95 cm.

Most roofs will be sheathed in plywood at least 3 8 inch thick. Place the first screw. Cut the material to fit around the base of all protrusions using a roofing knife. Secure the felt to the plywood using a hammer and 1 2 inch roofing nails.

W ork from the bottom up. This video shows how some roofs fail under heavy winds. Installing plywood on a roof hello youtubers here s another video about plywood sheathing and composition shingles after replacing all damaged wood and. For many years the standard option was lauan plywood also called philippine mahogany or luan plywood which is made with an inexpensive tropical hardwood and therein lies its problem.

After hanging rafters for a patio roof the next step is to lay plywood over the rafters using these helpful guidelines.