Roof sheathing and the gable truss.
Roof sheathing fasteners.
All fasteners are critical.
There is a common misconception in the building industry that screws always outperform nails when attaching wood to wood.
Use shingle underlayment felt conforming to astm d226 type i astm d4869 type i or astm d6757 self adhering polymer modified bitumen sheet underlayment should conform to astm d1970 or check roofing manufacturer s.
Spaced 3 8 of an inch from the edge and corners.
The roof framing members into which the sheathing fasteners are driven.
The critical placement of these fasteners are key.
Roe osborn a senior editor at jlc responds.
What size and type of screws are best to attach plywood over roof rafters.
Another consideration relates to the con dition of the building envelope during the high wind event.
Ventilate the roof according to current building codes step 3.
However if the authority having jurisdiction or the designer of record requires the use of corrosion resistant fasteners i e.
2 8d galvanized ring shanks with a nail gun.
Stainless steel galvanized etc for typical wood structural sheathing on the roof.
Wood of more dense species such as douglas fir or southern pine provides greater nail with drawal resistance and significantly improves the performance of the sheath ing nailing.
The critical fasteners occur at the gable framing member not necessarily at the edge of the sheathing.
Zip system sheathing and tape provides a water resistant durable underlayment for many finished roof coverings including metal tile and asphalt shingles fiberglass shingles and cedar shingles.
Check the nailing surface is level step 2.
Installing fasteners at less than 3 inches on center can split framing members and signifi.
It s true that screws have a highly effective withdrawal resistance which makes them excellent fasteners for tasks such as avoiding squeaks in flooring assemblies resisting uplift forces that occur in roofs and holding deck ledgers tight to.
Never screwed the plywood roof decking on.
The ten most important fasteners in a roof panel are the ones in each corner and the six in the intermediate panel edge connections.
Ridge vents when the roof sheathing is used as a structural diaphragm as it typically is in high wind and seismic hazard areas the structural integrity of the.
Nailing accuracy is crucial along this member.
Tighter fastener spacing schedules can be expected for homes built in high wind areas.
Believe me you don t want to have to remove one of these sheets when fastened at the proper nail spacing.
Sheathing panels to the supporting framing are acceptable to use with zip system sheathing.
Cover sheathing with.
Tighter nail spacing is recommended 4 inches on center maximum.
Zip system panels install fast and stay flat for a roof that looks as good as it performs.
Cover sheathing with shingle underlayment felt to minimize roof sheathing exposure to weather unless otherwise recommended by sheathing manufacturer.
Can screws be used instead of nails for attaching wall sheathing to framing.
