If your roof pitch is 3 12 or 4 12 multiply by 1 25.
How many felts are needed in a type b roof.
Ridge static attic vents 384 00 minimum sq.
After all each roof feature needs protection.
For example you may need to pay double the cost in asphalt shingles if your roof has a 12 12 pitch a rise of 12 inches 30 cm per 1 foot 0 30 m as opposed to a 4 12 pitch.
Of net free area of exhaust needed at or near the ridge.
Type 1 dead level asphalt is prohibited in the drain sump area.
It s a long single.
This guide will use the more durable 30 roofing felt although you can use 15 felt.
There are many new types of underlayment and it can be difficult to know which underlayment to choose.
Building codes for drip edges.
For the 1 150 attic ventilation requirement simply double the amount of exhaust and intake calculated.
There are almost as many types of roof flashing as there are parts of the roof.
Building codes for drip edges may vary per location.
For roof pitches of 5 12 to 7 12 use a factor of 1 3.
The weight or thickness needed will vary by regions but 15 pound suffices in most locales.
Fifteen pound or heavier felt underlayment is required by code in some areas.
Installing roof felt is a two person job.
These are the key types of roof flashing you need to understand.
Continuous flashing is also called apron flashing because it acts a lot like an apron.
L style or type c.
Use 1 4 for up to a 9 12 pitch.
About 1 30 1 60 per foot.
Metal deck sump pans are prohibited.
Multiply the total area determined in step one by a correction factor to account for the roof pitch.
Of net free area of intake needed at or near the soffit.
As stated in best practices guide to residential construction.
Must be installed at the rakes and eaves of the roof.
But in general the building codes for drip edges are.
About 0 60 0 89 per foot.
Is roofing felt underlayment needed under roof shingles tiles slate wood shingles or shakes.
About 0 49 0 79 per foot.
F style or type f.
The most common as we said before is the regular felt paper.
This correction factor will take into account the greater area of the roof due to the pitch.
The roof deck should be sound and level before laying the underlayment.
Step by step guide for felting a flat roof follow the 10 steps below in order to felt a flat roof.
Drain strainer m60 rubrpoly flashing sheets coverboard insulation thermal insulation clamping ring drain strainer drain.
