Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Roofing/Siding

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Search this Thread Display Modes
Old 03-31-2009, 10:04 AM   #1
Newbie
 
Join Date: Jan 2009
Posts: 6
Share |
Default

Second layer of asphalt roofing


Hey all...I have the original layer of asphalt and want to go over with a second layer my question is do I need to cover with an underlayment are there any reasons why I wouldn't put a second layer over the first also what ever advice would be appreciated it's an almost flat roof and i'm planning to do it myself, don't seem all that difficult.

hey, thanks in advance

Ernie

eefromjersey is offline   Reply With Quote
Old 03-31-2009, 12:35 PM   #2
Member
 
Join Date: Jan 2007
Posts: 2,384
Default

Second layer of asphalt roofing


A 2nd layer, although less expensive to do, will not provide the same life longevity cycle as a one layer roof. As a guess from past experiences, i would say about 25% less life from that roof.

So, are you really saving money, if 10 years down the road, if you still live there, you are now obligated to pay for a 2 layer tear-off and new reroof?

Adding a felt paper underlayment between the 2 layers will trap in moisture that will cause excessive trapped moisture under the top layer, creating premature blistering.

Without removing the original layer, any decking deflections or beginning stages of deterioration can not be readily observed and repaired.

If the old original roof is starting to deteriorate and curl or buckle, those defects will telegraph through the newly installed shingles early on in its life, creating the appearance of an already aged roof layer.

Ed

Ed the Roofer is offline   Reply With Quote
Old 04-03-2009, 11:55 PM   #3
Newbie
 
Join Date: Apr 2009
Posts: 10
Default

Second layer of asphalt roofing


All three points which you hace mentioned here is really useful and helpful. Here are they -

Adding a felt paper underlayment between the 2 layers will trap in moisture that will cause excessive trapped moisture under the top layer, creating premature blistering.

Without removing the original layer, any decking deflections or beginning stages of deterioration can not be readily observed and repaired.

If the old original roof is starting to deteriorate and curl or buckle, those defects will telegraph through the newly installed shingles early on in its life, creating the appearance of an already aged roof layer.

Certainly you have clear concept and I admire the way you make them understand.

__________________
roofing contractors | roof repairs | roof replacement
adelaide11 is offline   Reply With Quote
Old 04-04-2009, 12:24 AM   #4
Member
 
Join Date: Apr 2007
Posts: 406
Default

Second layer of asphalt roofing


And of course the part about being "almost flat".Instant red flag with me.How flat?
johnk is offline   Reply With Quote
Old 04-04-2009, 02:26 AM   #5
Member
 
Join Date: Jan 2007
Posts: 2,384
Default

Second layer of asphalt roofing


Quote:
Originally Posted by adelaide11 View Post
All three points which you hace mentioned here is really useful and helpful. Here are they -

Adding a felt paper underlayment between the 2 layers will trap in moisture that will cause excessive trapped moisture under the top layer, creating premature blistering.

Without removing the original layer, any decking deflections or beginning stages of deterioration can not be readily observed and repaired.

If the old original roof is starting to deteriorate and curl or buckle, those defects will telegraph through the newly installed shingles early on in its life, creating the appearance of an already aged roof layer.

Certainly you have clear concept and I admire the way you make them understand.

Thank you, Mr. German Guy who is now from Australia.

What is your name please?

Ed
Ed the Roofer is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Choosing The "Right" Roofing Contractor, How To Evaluate Who Is Right! Ed the Roofer Roofing/Siding 27 04-25-2013 05:10 AM
GAF Roof... the best EdPDX Roofing/Siding 73 09-12-2011 05:53 AM
Energy Star Qualified Asphalt roofing shingles? Scuba_Dave Roofing/Siding 50 09-28-2010 02:25 PM
Roll Roofing Repair IfItAintBrokeFixItAnyway Roofing/Siding 9 09-13-2009 05:32 PM
regular roofing asphalt paper under 3/4" wood floor? zel Flooring 4 07-12-2007 11:02 PM




Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.