Q:  How do I determine if a roof should be replaced?
    Sooner or later, every roof needs to be replaced, usually due to the long-term effects of weathering. If a
    residential roof is more than 20 years old, it is a prime candidate for re-roofing. To determine if you
    need to replace a roof:
  • On the ground, walk around your home with binoculars and inspect your roof for cracked, curled or missing
    shingles, as well as any excessive loss of the protective mineral granules. DO NOT CLIMB ON THE ROOF;
    walking on the roof is dangerous and can damage your roof.
  • In your attic, take a flashlight and look at the underside of the roof deck and rafters for any stains or wet spots
    indicating water leaks.
  • Asphalt shingles can often be applied directly over existing roofs without the necessity of tearing off the old roof.
    However, new shingles can not be properly applied over hard or brittle materials, uneven surfaces for nailing or
    roof decks with warped, rotted or unsound support that should first be replaced or repaired.
    NOTE:  Some local ordinances forbid re-roofing over two or more layers of shingles. If a home already has been shingled several
    times, it is important to first determine if the roof deck can support another layer of shingles before undertaking any re-roofing
    project.

Q:  What is causing the algae growth on my shingles?
A:   Algae growth is typically seen on light colored shingles.   It exists as a brown to black discoloration of
the shingle and is caused by an algae known as Gloeocapsa.  
    Although algae may exist on a shingle, it does not unduly affect the performance of the shingle.  
    Essentially, this is an aesthetic problem.  Due to the increase in algae discolored roofs, shingles are
    now available with small quantities of zinc or copper granules embedded in the mineral surfaced
    granule coating.  These particles inhibit the algae growth through some of the life of the asphalt roof.

Q:  Can you give me a cost estimate over the phone?
A: Not usually.  When we quote a price to our customers, we want it to be accurate.  No one wants a
surprise cost once a project is started.  Most projects require at least one meeting with a client in order for
us to gain an understanding of what is needed.  


We answer questions first to best address your Home Improvements.  We'll put on a new Roof,
replace shingles and siding, build additions or decks and remodel your home. Ask about our FREE
ESTIMATES.
This roof needs replacing.
Missing shingles and bowed
underlayment are definite
signs of trouble.  Replace!
Significant algae growth
Unsightly and hard to remove
from shingles, this problem
occurs for many homeowners.  
Do you have a question about
your roof?
Frequently Asked Questions
Coastal Construction Delaware LLC
Roofing and Construction Company
Frequently Asked Questions
302.346.3475
Expert