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 01-21-2014, 12:04 PM   #1
Newbie
 
Join Date: Jan 2014
Posts: 4
Share |
Default

New motorhome roof


Hello all,
I have a 38' class A motorhome and have torn off the old roof, adhered new 3/8" plywood on top and have a 10' wide sheet of TPO coming in for the sealed top membrane (no seams here.) I'm having a difficult time finding an adhesive product that will bond TPO to plywood, available to a non-commercial-roofer.

Any advice on what product will work for this is highly appreciated. I live in a small town and none of the local roofers here do TPO, so I can't get any "leftovers." I do have a fairly robust Ace hardware and a Lowes within reach. Any thoughts on this? (Please don't tell me I should have used EPDM or PVC. The TPO is on its way.)

I see Amazon has TPO primer I can get.

Thanks to everyone,

Chris

ChrisHelvey is offline   Reply With Quote
Old 01-21-2014, 01:23 PM   #2
Newbie
 
Join Date: Jan 2014
Posts: 4
Default

New motorhome roof


Ah Ha! I found it!
From bestmaterials.com: "Lucas Universal Bonding Adhesive For EPDM/TPO/PVC (1G)" plus a TPO primer and a TPO lap sealant for around vents.

I will use a sealant tape for the edges where it attaches to the vertical side.

Still, I'll take any helpful hints anyone with experience here has.

Thanks

ChrisHelvey is offline   Reply With Quote
Old 01-22-2014, 11:40 AM   #3
Low Slope Roofing
 
Join Date: Jan 2011
Location: Nebraska
Posts: 440
Default

New motorhome roof


I did our old 60's forest river TT with TPO, mostly because we didn't have any white EPDM in the shop at the time.

What I did was.

1.Removed all vents from the roof.
2. Removed the metal drip rails from the sides. Not sure if yours has the metal or plastic ones.
3. Lay out the TPO get it straight ect.
4. Pull TPO 1/2 way back. glue the new plywood first. the wood will take a bit of extra glue, don't skimp there. Then glue the sheet.
5. Allow the glue to flash off. roll TPO sheet, keep the front edge in a semi circle. TPO rolls out nice and easy.
6. Broom it down using hard pressure.
7. Pull 2nd part of the sheet back and repeat the steps.
8. Get all new vents. sealing the old ones will be hard.
9. Install new vents in "water stop" or "water cut off mastic" a small bead on the flange goes a long way. make sure to cut the holes in the membrane first. Screw them down with flat headed screws.
10. Clean and use the TPO primer and cover tape to strip in the seams of the vents.
11. Install the drip rails on the sides. Cut off the extra membrane. Use new screws.
12. Install Termination bar on the front and rear. turn the T-bar upside down so the leg is sticking down. Very carefully caulk this edge so no water can migrate in. A small bead and soap and water will help you keep it look neat.

Good luck they will last a long time.

Dont just set the vents down in goop like they do with the new campers. I bought 2 new travel trailers, one last year and one two years before hand. Both roofs were White EPDM, but all the vents were just set in goop with goop smeared around them. Wrong way to do it IMO.

We've done a few campers and food trailers with EPDM and TPO. Works well.
1985gt is offline   Reply With Quote
Old 01-22-2014, 04:48 PM   #4
Newbie
 
Join Date: Jan 2014
Posts: 4
Default

New motorhome roof


Thanks for your response. So, you started in the center. That makes sense. Do you use the PTO primer on the bottom side of the roll too, or just on the top where you use the tape?
ChrisHelvey is offline   Reply With Quote
Old 01-23-2014, 11:27 AM   #5
Low Slope Roofing
 
Join Date: Jan 2011
Location: Nebraska
Posts: 440
Default

New motorhome roof


The primer is only for the tape. Get a cleaner also. Clean, prime then stick the tape and roll it in with a neoprene roller. The glue goes on the substrate (plywood) and the sheet also.
1985gt is offline   Reply With Quote
Old 01-23-2014, 12:18 PM   #6
Newbie
 
Join Date: Jan 2014
Posts: 4
Default

New motorhome roof


Do you have a recommendation for a good PTO cleaner?
ChrisHelvey is offline   Reply With Quote
Old 01-24-2014, 12:15 PM   #7
Low Slope Roofing
 
Join Date: Jan 2011
Location: Nebraska
Posts: 440
Default

New motorhome roof


http://www.bestmaterials.com/detail.aspx?ID=17483

1985gt 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
Proper transition between shed roof and shingled roof? aribert Roofing/Siding 9 04-12-2012 03:17 PM
Tell me about roof coatings for an older roof Leica Roofing/Siding 3 09-19-2010 01:55 PM
Flat roof and insulation quandry paredown Roofing/Siding 2 08-20-2010 11:50 PM
Tying new roof into old. Clutchcargo Roofing/Siding 15 11-07-2009 05:48 PM
Please help with the design of this roof jaymay75 Building & Construction 1 05-06-2008 09:44 AM




Top of Page | View New Posts

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