Roof Sheathing 1 8 Expansion

An easy way to keep it consistent is to space the sheets with a common framing nail.

Roof sheathing 1 8 expansion.

Plywood sheathing is ideal for residential and light plywood sheathing is ideal for residential and light construction and every piece meets the highest grading standards for strength and appearance. We had an inspector turn down a house framed by another framer for too much gap. Without this full gap sheathing can expand under moist conditions and you can end up with the sheathing warping. Some older h clips do not provide a built in gap.

Not always required but a good idea. H clips provide additional stiffness between bearing points for the unsupported edges of wood panel plywood or osb roof sheathing along with the necessary 1 8 gap for expansion as shown below illustrated on a bag of simpson h clips. The inspector told the guy that it could pass if he blocked the gaps on the entire roof deck. Provide 1 8 minimum space at panel ends and edges.

Complete the second row offset one rafter width from the first then move onto the third row and so on until the last. Panel end joints shall occur over framing. Unless it s t g ply getting the sheets to 0 gap is almost impossible. The osb sheathing we get locally has an installation stamp on its down side that states 1 8 minimum gap at ends and sides.

Probably the best way to explain it to your contractor is to tell him it s the recommendation of the apa and most building codes. The standard gap is 1 8. Help prevent sheathing warping our clips leave a precise 1 8 gap created from a full width spacer bar. It adds proven performance and durability to new homes room additions and renovations.

No need to cut. 10d box nail to assure accurate and consistent spacing. If the wood structural panels are tightly butted there is no room for expansion and buckling can occur. Apa recommends a 1 8 inch space between panel edge and end joints.

For improved performance consider thicker roof sheathing panels panel edge clips or panels with tongue and groove edges. Check building code requirements for installation of panel edge clips. 1 8 gap is 1 16 per sheet side. Plywood and oriented strand board osb like all wood products will expand or shrink slightly with changes in moisture content.

A 1 8 inch space between adjacent panel end and edge joints is recommended unless panel manufacturer indicates otherwise. Raise the sheathing 1 8 inch above the previous row and nail it into place. Use a spacer tool i e.