Place the top of each starter shingle firmly against the bottom of the shingle immediately above it and even with the eaves then nail it into place.
To layer on top of each other roofs.
The roof is a system composed of layers of different materials that work together to keep wind and weather out of your home.
Local codes might not allow re roofing.
Understanding the different layers of a roofing system is crucial to having a successful project and positive experience when hiring a roofing contractor.
By placing shingles on top of a damaged roof you ll affect the way the roof looks.
Now you just have to decide whether to remove the existing roof shingles or recover the roof.
Since it s being put on top of another less than perfect roof it s likely that it may not look as good as a brand new roof would.
Each layer has a specific purpose that when combined with the other components provides protection to your home.
It s usually a peel and stick product that adheres directly to the roof deck.
More difficult to check deck when you tear off the old roof you get a look at what s underneath.
Water shield is the next roofing layer that creates a water proof barrier where ice or water can buildup near the roof eaves.
Steep sloped roof products such as tile slate metal and shakes only allow one layer.
Roof deck is the roofing material that sits on top of the roof trusses.
Most roof decking is made from sheets of plywood.
You don t have.
Having multiple layers of shingles is going to make your roof hotter because the heat gets trapped between the layers which could mean premature aging of the shingles.
Nailing here will cause the next shingle to cover the nail heads and allow the next and subsequent rows of nails in shingles to always penetrate and hold the top edge of the lower row this allows 8 nails to hold each.
For example towns in climates with heavy hailstorm activity or significant ice dam problems may not allow multiple roofing layers.
Also place a nail 2 inches from each end of the shingle in line with the other two.
Here are the layers of a roof in order of application bottom to top.
Use 1 5 or 1 75 inch roofing nails.
Two layers is the maximum in most areas but some building codes allow only one.
Asphalt shingles typically can have one more layer added over the top two roofs total.
Decking wood sheathing the decking is the base on which everything else is laid.
For many years it was acceptable to put even the third layer.
But contractors who spoke with angie s list say best practices call for stripping the roof down to the wood deck to inspect it before installing a new roof.
In all use four nails per 3 tab shingle.
This is especially true if you ve overlayed your new shingles on top of warped shingles.
A re roof might not look good on an inspection report.
