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FAQ: Do I Need to Remove the Old Roof Before
Installing a New Roof?
The advantages to
leaving an old roof and overlaying a new roof on top of it are obvious:
faster, cheaper, less labor and no additional disposal costs. However,
unless the initial roof is only a
one-layer roof
with no problems,
removal of the old roof is recommended.
Talk to your
contractor about removing the old roof if any of the following is true:
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The existing roof is in poor condition - shingles
are curled, mossy, split, etc.
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The decking is sagging, rotting or deteriorating.
-
You are replacing an old roof with a new roof that
is a lighter material. (For example, laying lightweight shingles over
heavyweight shingles will show all the bumps and ridges of the initial
roof.)
-
There is already more than one layer to your old
roof.
-
If you live in a climate zone where the average
January temperature is below freezing and the old roof has no ice or
water protection membrane. (Ice dams can form if excess water is trapped
below the old roof. Ice dam problems may not be noticeable until an
unseasonably cold winter, but can cause thousands of dollars of damage
to the house.)
In general, it is
thought that the
longevity
of a new roof will be
shortened by 10-20%
if
it is installed as an overlay to an existing roof.
View
Different
Types of Roof Problems
MAKE
THE RIGHT MOVE –
CALL CHESS TODAY FOR A FREE ESTIMATE:
(248) 398-1050 or click
for online estimate form
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