Gaps Between Roof Sheathing

The sheathing just provides a nailing surface and support for the shingles as the gaps have no effect on water tightness.

Gaps between roof sheathing.

It s a simple gable roof with vents at either end and a ridge vent. The recommended maximum gap between roof sheathing boards for low quality 3 tab shingles is 1 4 inch. Now wait a minute. However it is considered good practice to leave a 1 8 gap between sheets and that is also recommended by apa but it is not required.

Gaps that were initially present may have closed due to normal moisture related expansion. But where the wall sheathing meets the roof sheathing there is a gap of approximately 1 8 of an inch. It doesn t mean that panel edge clips h clips are required although there are types of clips that will help with properly spacing the panels. One on the reasons i recommend using ice water sheild over the entire roof when having shingles replaced.

If the flatness of sheathing or flooring panels is acceptable apa would generally recommend that any finish flooring siding or roofing be installed as planned regardless of whether gaps are present. Yes a 3 8 inch gap is a pretty good gap to start with. And i was advised that that gap should be protected by a home inspector. The exterior face of the foam sheathing will be the water control layer and there will be a gap there must be a gap between the cladding and the exterior face of the foam sheathing.

The house does not have an overhang. If asphalt shingles are installed over sheathing with gaps exceeding 1 4 inch over time these gaps may telegraph through and become visible. Actually panels marked sized for spacing simply mean that they are slightly smaller to allow for the recommended 1 8 gap see attached apa tt 055.