1x6 Tongue And Groove Roof Sheathing

This arrangement is applicable to 4 or more supports 3 or more spans.
1x6 tongue and groove roof sheathing. With less than 4 supports a special pattern requiring specified lengths must be used. The main reason to use tongue and groove boards these days is appearance from beneath the roof. This tongue and groove decking combines appearance grade with unsurpassed quality of finish making them ideal for exposed ceiling applications. Rafters it shouldn t be an issue.
Wood is an excellent insulator and in moderate climates no additional rigid insulation on the roof is necessary. The keyword here is solid it used to be standard to use shiplap 1 boards tongue groove or other boards for the roof deck. All end joints occur in line on every other support figure 6. In my experience the need for tongue and groove or edge clips is determined by the thickness of the roof sheathing and the spacing of the rafters.
Some use clips as convenient spacers. For 5 8 or thicker roof sheathing on 16 o c. 4 tongue and groove roof decking. These 8 to 12 inch wide boards were nailed together tight.
But as it is tongue and groove the load will also be transferred over the adjacent pieces. Old houses with asphalt shingles usually had either tongue and groove boards or straight sided boards abutting. On 24 1x6 will work but put a layer of sheathing down to eliminate the roofing nail issue. You maybe able to do a deflection calculation with the calculators in the red tool box on this site.
As wood dries it shrinks. Tongue and groove commonly used as roof sheathing where a ceiling will not be installed and they will be visible from inside the house such as across beams in a vaulted ceiling. But you re going to have to do some of the load math to figure out what the exact load will be on one piece of the tongue and groove. Tongue and groove boards were used for decades prior to the widespread adoption of plywood as a sheathing material in the 1950s and 1960s.
But the lumber was not usually kiln dried. Roof deck 2x6 or 1x6 t g we use 1x6 up to 3 but the roof is then strapped after with 2x4 then sheathing. When the roof was first nailed on of course all the nails were in solid wood. Tongue groove boards.