Roofing & Estimating

Question 1

When is solid roof sheathing recommended?

Answer 1

zero degrees or colder; 1x6 recommended for solid roof sheathing

Question 2

How do you determine spacing of sheathing boards?

Answer 2

equal to weather exposure

Question 3

Underlayment purposes: there are 6

Answer 3

1. protects roof sheathing prior to roof install
2. acts as added weather protection for building
3. separates asphalt shingles from areas where surface resins in wood sheathing may damage the shingle
4. provides insulation
5. cushions heavy roofing units like slate/tile; prevents breakage
6. when hot temps it prevents asphalt from leaking into the building

Question 4

underlayment installation: installed where? how many inches at top lap? and end lap?

Answer 4

installed over the drip edge at the eaves and under the drip edge at the rakes; 2 inch top lap and 4 inch end lap

Question 5

what protects the coating asphalt from UV rays?

Answer 5

mineral granules