"Dirty" Asphalt Shingle Roof

Old 10-02-09, 05:49 AM
Thread Starter
Join Date: Oct 2009
Location: Connecticut
Posts: 2
Upvotes: 0
Received 0 Upvotes on 0 Posts
Question "Dirty" Asphalt Shingle Roof

The west side of our 20 yr.old asphalt shingle roof has numerous spots of green lichen growing on it. Just like the stonewalls here in olde New England. Is there a effective way to clean the roof ? or should we just consider replacing it. It's a modular cape built in Penn. in 89'.

Tks.... :
Old 10-02-09, 08:48 AM
Temporarily Suspended
Join Date: Jul 2008
Location: NY
Posts: 10,265
Upvotes: 0
Received 0 Upvotes on 0 Posts
Lift one of the shingles. Is it flexible or brittle? If it's brittle & about to break, replace it. If it's flexible, a light pressure wash may clean it.
Old 10-02-09, 12:58 PM
Group Moderator
Join Date: Mar 2003
Location: NC, USA
Posts: 27,770
Received 2,183 Upvotes on 1,953 Posts
One thing you can try after getting the roof clean is to run a bare copper wire parallel to the ridge and just below the ridge line, and then another every 4-5ft down the roof. When it rains copper leaches off the wire and helps prevent growth on the shingles. The copper wire will be shiney at first but soon tarnishes and is hardley noticeable.

Thread Tools
Search this Thread
Ask a Question
Question Title:
Your question will be posted in: