Framing New Roof Over Old

When you should tear off your roof and start from scratch instead.

Framing new roof over old. 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 rafters should be placed every 2 4 inches for proper support of the roof. The amount of rafters needed will depend upon the size of the roof. Build the rafters on the ground and then lift them onto the roof.

In this case you can build a new roof over the old with a caveat. 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. The solution is changing the roof pitch or building a new roof at a higher pitch than the old roof. The remedy may be stripping the roof and nailing 1 2 in.

You must not build the new roof directly over the old. Plywood over old sheathing or bolstering undersize rafters with new lumber but let a seasoned professional make the call. Many arizona homeowners with shingle roofs do decide to roof over their existing shingles because. The sheathing must be stripped from the old roof for a couple feet along the bottom to get the new ceiling joists in.

When necessary to tie the new rafters into the house framing the workers cut into the old roof to make the secure connections. Let s start with the good. Roofs are framed out of lumber and pieced together in a series of triangles designed to bear the load. You can frame a new roof over the old but it will need to be designed for the span and pitch.

Curling or crumbling shingles. How much does it cost to frame a new roof. The rafters should be in a triangular form with an additional piece of 2 x 4 going straight up the center. A new coat of shingles over decaying shingles will cause your roof deck to decay.

Use 1 5 or 1 75 inch roofing nails. 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. The exposed edges of the 3 layers of rigid insulation are no longer exposed. 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.

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. 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. The average cost of framing a new roof is 16 000. If a roof is relatively new and these symptoms are widespread suspect product defects inadequate ventilation faulty installation.