Installing a new roof over an existing one also called a layover or nailover is often possible although not always the best option.
Muдequitos in a bundle of roofing.
A pvc roofing system such as the one from ib roof available in either 50 mil 60 mil or 80 mil thickness would be an ideal type of a roofing membrane for such a roof.
Roof coverings are addressed in chapter 15 of the ibc and chapter 9 of the irc.
The standard nailing for asphalt shingles is a four nail pattern with nails placed 1 inch from each end of each shingle and then two nails placed 12 inches in from the end nails.
How to install a roof over an existing roof.
The roof will not be entirely flat as you will need to plan for rain water drainage via water drains placed strategically within the roof surface.
The roof joists beams etc.
Or if all the sheathing will be replaced.
I have roof top delivery for every roof except a small multi layer steep tear off every now and then.
A look at different roof installation methods.
The system includes all the.
A metal roof can last 50 years while slate roofs can last more than 100 with diligent upkeep.
For one you will need to check with your local building department and ask if this is an approved installation method.
The other builder i load so i usually make three stacks for a 30 35 sq house.
One big advantage to metal roofing is its light weight which means metal roofing can be installed over an existing shingle roof.
If installing a new roof on a bare roof deck cut 6 inches off the first starter course shingle and apply the rest of it on the lower corner of the roof overlapping the rakes and eaves by 1 2 inch.
One of my builders loads the roofs but stacks them like dominoes hard to grab shingles since i have to bend over for every bundle.
Both codes provide requirements for roof coverings commonly used on high sloped roofs such as asphalt shingles clay and concrete tile wood shakes and shingles and metal roofing and for roof coverings typically used for low slope.
1 bundle of arcs in a little over a minute with a feeder of course my feeder at the time was my right hand man he kept supplied with shingles faster than i ever could by myself.
However there are some things that you will want to check out before doing it this way.
No permit is required for a job where you roof over an existing layer or replace only part of the roof sheathing second cold process application of modified bitumen roofing is best done in warm dry weather.