Before you reshingle a roof read our step by step guide for adding new shingles over old ones.
Is it ok to overlap for roof paper.
Snap a chalk line the.
The installation of metal roofing involves placing large metal panels on the roof.
As a first line of defense against water damage it is important that the metal roof overlap be implemented correctly.
Asphalt shingles can be laid over cedar shakes or shingles however this is a roofing project best left to pros.
Also called roof felt or builder s felt overlapped tar paper creates a water barrier that is your home s last line of defense against the elements if your shingles are damaged by wind hail or age.
Roofing felt is required to overlap 2 inches over the lower felt course.
No previous or existing leaks.
You want each piece to overlap the piece below it.
High winds can push water or snow up the roof and under shingles or tiles.
The panels overlap allowing water to flow from one panel to the next without being able to penetrate the area under the roofing panel.
A steep roof is 4 12 or greater meaning that the roof rises four feet for every 12 feet of length.
Therefore a 2 inch overlap provides redundancy at the edges where the barrier is weakest.
Start at the bottom of the roofline and work up so any water that gets through the roofing material will shed down the tar paper and will not go under it.
The overlapping felt creates a secondary barrier for moisture and wicks water away from the shingles above and the sheathing below.
The best case scenario for an overlay is sound decking.
Beveled wood pieces called horsefeathers must be laid along the thick edges of the shakes to make a fairly flat surface.
As you work the paper can be tacked down in the center so it won t blow away.
When you overlay a new roof you attach the new shingles or other roofing material to the existing roofing material.
This may not seem like the obvious way to replace a roof but many homeowners choose this method for some significant advantages.
The trick is to make sure you install it so it overlaps correctly.
The roofing felt should be applied in layers that overlap.
Align this layer with the bottom of the roof.
And a roof with no sidewalls where flashing is needed to tie in the roofing material to the exterior walls of.
Feathers on birds fur on animals and shingles on a roof use this same method to stop water penetration.
