Position the first piece of plywood.
Roof sheathing installation overhang.
At exposed roof overhangs the sheathing must be rated for exposure to the weather.
When one slope is completely sheathed pop a chalk line down any slope edge as in a hip roof that needs to be cut at an angle.
Measure from the peak of the roof along each rafter on one side of the roof to determine the exact length of each.
Sheath one slope of the roof at a time ripping the top course to the needed width at the ridge.
Some slight overhang is recommended in conjunction with a drip edge flashing to prevent water from getting under the roofing and onto underlying wood.
A typical metal roof overhang may be 2 to 4 inches or even less.
And scroll down to see more details on each with installation hints and tips below.
Metal is usually installed on rafters or strip sheathing rather than the solid decking used under other materials.
Place corner pieces where panels will meet bends at the edge of the roofing.
If there are gutters installed on the eaves the eave flashing should be installed to overhang the lip of the gutter by about 1 2 inch.
This indicates the truss tails.
Cover sheathing with.
Roof sheathing thickness maximum overhang length attachment 7 16 1 2 in.
2 10d common nails per plank 1x8 to 1x10 planks 24 in.
Osb or plywood 18 in.
8d ring shank nails at 4 in.
Cut each rafter tail on the chalk line with a circular saw to ensure that every rafter is the same length.
How to install roof sheathing 1.
The everyday sheathing used on the body of a roof is not rated for weather exposure so when exposed eaves and or rakes occur at the perimeter a different more expensive weather rated grade of plywood or osb must be used.
Check the nailing surface is level step 2.
A tapered piece of sheathing can be cut to fill in at the eave if necessary.
Then we re going to use a scrap of 2x4 to space off the square and strike a line there.
10d ring shank nails at 4 in.
Osb or plywood 18 in.
When installing roof sheathing use nails with longer nail shank larger diameter and a larger head than may be required.
Ventilate the roof according to current building codes step 3.
Properly fasten panels including fastening and spacing hints step 4.
3 10d common nails per plank.
Also use more nails and place them closer together to build a stronger roof.
