DIY Home Improvement, Remodeling & Repair Forum > DIY Home Improvement > Roofing and Siding > Replacing metal roof with asphalt shingles




Help Support House Repair Talk by donating using the link above.
Reply
 
Thread Tools Search this Thread
Old 07-29-2017, 07:58 AM  
bud16415
Fixer Upper
HRT_ADMIN.png
 
bud16415's Avatar
Join Date: Feb 2013
Location: Erie Pa, Pa
Posts: 4,324
Liked 1437 Times on 1100 Posts
Likes Given: 774

Default

Quote:
Originally Posted by oldognewtrick View Post
If it were mine, I would use drip edge, capping, transition flashing and cover the rake edge with preformed metal. Don't use roofing felt as an underlayment, use a high temp peal and stick smooth back underlayment. Where you order the panels will also have all the accessories you will need.

Roofing felt will degrade over time from exposure to the high temp of contact with the metal.
If he has 1x8 purlins running across his roof and he takes the old tin off to replace it wouldn’t he just put the new tin back directly to the purlins. Should there be strips of the peal and stick covering the purlins? Or are you suggesting he cover the purlins with sheathing like he was going to shingle and then the peal and stick and then the tin?


bud16415 is offline  
 
Reply With Quote
Old 07-29-2017, 08:56 AM  
oldognewtrick
HRT_ADMIN.png
 
oldognewtrick's Avatar
Join Date: Jul 2009
Location: Nashville, TN
Posts: 10,671
Liked 1380 Times on 1096 Posts
Likes Given: 403

Default

All metal roof mfgs suggest installing over solid decking. Condensation will occur under the panels in the right condition. There should be a barrier to eliminate this from happening.


oldognewtrick is offline  
 
Reply With Quote
Old 07-29-2017, 08:58 AM  
oldognewtrick
HRT_ADMIN.png
 
oldognewtrick's Avatar
Join Date: Jul 2009
Location: Nashville, TN
Posts: 10,671
Liked 1380 Times on 1096 Posts
Likes Given: 403

Default

If he shingles the roof, he will need to install solid decking anyway. Forget the cheap shortcuts, pennies now are dollars later.
oldognewtrick is offline  
 
Reply With Quote
Old 07-29-2017, 09:05 AM  
nealtw
Contractor retired
 
nealtw's Avatar
Join Date: Nov 2010
Location: Upper Fraser Valley, British Columbia
Posts: 23,375
Liked 2922 Times on 2561 Posts
Likes Given: 4811

Default

Just fill in the gaps in strapping where the ice shield goes. Likely a good time to add a few inches to the height of the front roof as there little or no insulation there.
nealtw is offline  
 
Reply With Quote
Old 07-29-2017, 10:32 AM  
JoeD
Senior Member
Join Date: Mar 2006
Location: Welland, Ontario
Posts: 1,456
Liked 249 Times on 211 Posts
Likes Given: 17

Default

Never heard of the requirement for sheeting under a metal roof.
JoeD is offline  
 
Reply With Quote
Old 07-29-2017, 11:32 AM  
oldognewtrick
HRT_ADMIN.png
 
oldognewtrick's Avatar
Join Date: Jul 2009
Location: Nashville, TN
Posts: 10,671
Liked 1380 Times on 1096 Posts
Likes Given: 403

Default

Quote:
Originally Posted by JoeD View Post
Never heard of the requirement for sheeting under a metal roof.
Like a lot if things in life, most folks don't read the fine print.
oldognewtrick is offline  
 
Reply With Quote
Old 07-29-2017, 01:19 PM  
bud16415
Fixer Upper
HRT_ADMIN.png
 
bud16415's Avatar
Join Date: Feb 2013
Location: Erie Pa, Pa
Posts: 4,324
Liked 1437 Times on 1100 Posts
Likes Given: 774

Default

I know the roof I just had done by the boys with straw hats using ag roofing was the short cut method they have been doing around here for the last 30 or 40 years. Maybe 1/3 of the houses up and down the road are now done this way. As an example my 1800 SQ FT 2 story house with 8 facets to it one hip section cost me 2000 for material all 26 gage tin and all 2X stock for the build outs purlins and frame. And 1000 for labor to put it on. I would loved standing seam residential material done to the process oldog is describing but I think I would of ended up about 3 times the cost. Time will tell how this works out but I have talked to dozen of people that did this method and they are happy long past where shingles would needed replaced. My roofs are 10/12 pitch and with the 1.5 air gap in there now I will say the attic hasn’t been this cool during the 90 deg days we have been having and the roof is a dark green in the 4 years we have been here and my guess is in the 130 years the house has been standing. We got our old eve venting going on and we now have this air movement under the new roof and ridge venting. Part of it could be when I took the chimney down I left the hole at the ridge and the attic can now vent into the ridge there. We have had some hard rains and nothing seems to be getting in there so I will leave it open for now.

My biggest hope is the roof will now shed snow during the winter better. I didn’t have them add any of the snow catchers to the roof. About half the roofs here have them and half don’t. most of the roof doesn’t have gutters also.

I’m assuming the roof Chris is talking about is on a rental house he is rehabbing. Almost all the landlords around here are covering old places up with the short cut ag method. The only people I hear not happy with them are the firemen as they cant get water thru the roof when needed. On the other hand the fire hall has this roof as do most of the firemen I know. Like I said I was leery of doing it but was willing to see how it worked for the price. Changing shingles all the time it seemed anyway was getting old for me. if this lasts 40 years like they say I’ll be 102 and wont give a damn. Haha.
bud16415 is offline  
 
Reply With Quote
Old 07-29-2017, 11:08 PM  
buffalo
Senior Member
Join Date: Nov 2013
Posts: 277
Liked 49 Times on 42 Posts
Likes Given: 125

Default

Under my metal roof is a plastic liner , and under that bubble wrap insulation . All installed on Perlins over trusses , no sheeting.
buffalo is offline  
 
Reply With Quote
Old 08-17-2017, 07:51 AM  
mabloodhound
Restoration & Renovations
Join Date: Jun 2008
Location: Halifax, MA
Posts: 98
Liked 22 Times on 17 Posts
Likes Given: 18

Default

Stick with the metal roof. Last a lot longer than shingles. Plus it's enjoyable to listen to when it rains.
mabloodhound is offline  
 
Reply With Quote
Old 08-17-2017, 08:32 AM  
Chris
Guru of nothing
HRT_ADMIN.png
 
Chris's Avatar
Join Date: Jul 2013
Location: Sweet, Idaho
Posts: 4,448
Liked 1004 Times on 747 Posts
Likes Given: 107

Default

I ended up sheeting and going with shingles. I like the metal but on this house I think the shingles will look better. House is about halfway done now.


Chris is offline  
 
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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


Similar Threads
Thread Thread Starter DIY Home Repair Forum Replies Last Post
Holes in asphalt shingles / possible hail damage kmwest Roofing and Siding 15 10-30-2016 09:47 PM
Flat Metal roof addition transition from shingles tk3000 Roofing and Siding 5 10-28-2016 01:04 PM
Staining from siding caused by asphalt shingles samiam1955 Roofing and Siding 2 10-06-2014 11:03 AM
Metal Roof Install Over Existing Shingles? papakevin Roofing and Siding 2 03-15-2012 04:27 AM
Best way to cut through asphalt shingles on the roof? TomS Roofing and Siding 2 09-29-2011 05:29 PM



Newest Threads