Roof Sheathing 1 8 Expansion

Plywood and oriented strand board osb like all wood products will expand or shrink slightly with changes in moisture content.

Roof sheathing 1 8 expansion.

An easy way to keep it consistent is to space the sheets with a common framing nail. For improved performance consider thicker roof sheathing panels panel edge clips or panels with tongue and groove edges. No need to cut. Apa recommends a 1 8 inch space between panel edge and end joints.

Plywood sheathing delivers outstanding rigidity strength and versatility and is an excellent choice for. We had an inspector turn down a house framed by another framer for too much gap. The standard gap is 1 8. Without this full gap sheathing can expand under moist conditions and you can end up with the sheathing warping.

Raise the sheathing 1 8 inch above the previous row and nail it into place. That can mean costly time consuming callbacks. 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. Help prevent sheathing warping our clips leave a precise 1 8 gap created from a full width spacer bar.

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

The inspector told the guy that it could pass if he blocked the gaps on the entire roof deck. It adds proven performance and durability to new homes room additions and renovations. Check building code requirements for installation of panel edge clips. Use a spacer tool i e.

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. Panel end joints shall occur over framing. Some older h clips do not provide a built in gap. 1 8 gap is 1 16 per sheet side.

If the wood structural panels are tightly butted there is no room for expansion and buckling can occur. 10d box nail to assure accurate and consistent spacing. Not always required but a good idea.