The sheathing must be stripped from the old roof for a couple feet along the bottom to get the new ceiling joists in.
Framing new roof over old.
You can save money because there s no dump fee for removing your old roofing and there s no need for additional felt paper over the old roof.
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.
How much does it cost to frame a new roof.
Many arizona homeowners with shingle roofs do decide to roof over their existing shingles because.
While it might look possible to use the old ceiling joists they would need to be grade checked to make sure they meet the present code.
If a roof is relatively new and these symptoms are widespread suspect product defects inadequate ventilation faulty installation.
When roofing over your existing shingles can be a good idea.
The rafters should be placed every 2 4 inches for proper support of the roof.
But if you have an old home with a decaying roof especially a low pitched roof removing the old roof and replacing it may not be practical.
The average cost of framing a new roof is 16 000.
In this case you can build a new roof over the old with a caveat.
The amount of rafters needed will depend upon the size of the roof.
Let s start with the good.
When you should tear off your roof and start from scratch instead.
And the variables of design don t stop there the builder must determine the pitch or slope of the roof and use that measurement to figure the total rise from the wall s cap plate to the roof ridge.
If you are building a new home putting an addition on an existing home or replacing your roof down to the rafters you will need a new roof frame.
Build the rafters on the ground and then lift them onto the roof.
You must not build the new roof directly over the old.
The solution is changing the roof pitch or building a new roof at a higher pitch than the old roof.
Why installing new shingles over old shingles can be good.
Use 1 5 or 1 75 inch roofing nails.
A new coat of shingles over decaying shingles will cause your roof deck to decay.
Roofs are framed out of lumber and pieced together in a series of triangles designed to bear the load.
Box beam gable framing new gable overhang is framed in the form of a box beam hanging off of a new layer of roof plywood roof sheathing cantilevered over the top of the 3 layers of rigid insulation.
The rafters should be in a triangular form with an additional piece of 2 x 4 going straight up the center.
Plywood over old sheathing or bolstering undersize rafters with new lumber but let a seasoned professional make the call.
You can frame a new roof over the old but it will need to be designed for the span and pitch.
When necessary to tie the new rafters into the house framing the workers cut into the old roof to make the secure connections.
