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 04-30-2010, 09:46 PM   #1
Newbie
 
Join Date: Apr 2010
Posts: 6
Rewards Points: 10
Default

Roof for Garage-Nursery


Hi All,

I plan on converting a spare garage into a plant nursery, and, the construction of the garage is wood. There are wooden beams which support the triangular frame of the roof running about 8 feet from the ground, I guess what you'd call the base of the triangle, and, I thought I'd make another roof which would protect these beams from the humidity which the garage will become saturated with, hopefully protecting the beams from woodrot and extending their lifespan. What would be a good way to do this? I know nothing about home improvement, I thought, maybe, take sheets of some substance... drywall? Foam sheeting? I don't know. Take sheets of some unknown substance, something that protects very well against moisture, and then nail them into the wood beams, until a new roof was formed.

I'm sure there would be a better way to do this, help is appreciated!

Thanks,

Jim

Earthworm Jim is offline   Reply With Quote
Old 04-30-2010, 10:44 PM   #2
Commercial Roofing
 
AaronB's Avatar
 
Join Date: Jan 2005
Location: Illinois
Posts: 927
Rewards Points: 500
Default

Roof for Garage-Nursery


Closed cell spray foam insulation.

__________________
www.roseroofing.net/ Free inspection within 12 miles
Seamless Polyurea Roofing Membranes for Metal Roofing, Roof Leak Repair, Seamless Commercial Spray Foam Insulation, Seamless Commercial Roofing, SPF Roofing, Industrial Insulation, Our trucks are red but our roofing is GREEN!
AaronB is offline   Reply With Quote
Old 05-01-2010, 01:22 PM   #3
Newbie
 
Join Date: Apr 2010
Posts: 6
Rewards Points: 10
Default

Roof for Garage-Nursery


Thanks for the response. I wonder if this would be a good choice of material to create a barrier for the walls, too, which also have wooden beams exposed?

Do you think that, if I coated the inside of the bare structure with a few coats of waterproof paint, then, added the foam insulation, then, sprayed that with a couple coats of paint, it would keep the wood safe for several years? I was also then thinking, that I'd add an extra barrier, layering the foam insulation with clear 3 mil plastic sheeting... do you think that, with all these extra layers of protection, there would be a problem with condensation building up in between, cancelling out the purpose of being water/ mold proof?

Thanks,

Jim
Earthworm Jim is offline   Reply With Quote
Old 05-01-2010, 03:06 PM   #4
Commercial Roofing
 
AaronB's Avatar
 
Join Date: Jan 2005
Location: Illinois
Posts: 927
Rewards Points: 500
Default

Roof for Garage-Nursery


Once you spray 2" of foam, you will not need another moisture barrier to protect the wood from the inside.

To leave it like this, the structure must not be inhabited nor attached to an inhabited structure. If it is either if these scenarios, then you need a fire barrier.

You should, however have a way of extracting the moisture from the building when needed. like a powered exhaust fan.
__________________
www.roseroofing.net/ Free inspection within 12 miles
Seamless Polyurea Roofing Membranes for Metal Roofing, Roof Leak Repair, Seamless Commercial Spray Foam Insulation, Seamless Commercial Roofing, SPF Roofing, Industrial Insulation, Our trucks are red but our roofing is GREEN!
AaronB is offline   Reply With Quote
Old 05-01-2010, 07:03 PM   #5
Registered User
 
Join Date: Mar 2009
Posts: 9,967
Rewards Points: 2,000
Default

Roof for Garage-Nursery


I agree with Aaron except SPF, at 2" has a permeability rating of .75. To be a vapor barrier, Class I, it would need to be 8" thick (.094). But you could use a v.b. paint to stop the moisture. http://www.henry.com/fileadmin/pdf/H...l_Brochure.pdf

Be safe, Gary
__________________
If any ads are present in my answer above, I do not condone/support/use the product or services listed, they are there against my permission.
Gary in WA is offline   Reply With Quote
Old 05-01-2010, 10:18 PM   #6
Newbie
 
Join Date: Apr 2010
Posts: 6
Rewards Points: 10
Default

Roof for Garage-Nursery


Sorry, what's v.b. paint? What does the v.b. stand for? You think if I applied this after the 2" of foam were applied, it would be roughly as effective as 8", since I'm sure spraying 8" would be significantly more expensive? Would it be worth it to spray paint, then have foam sprayed, then spray another layer of paint on the foam?

Thanks,

Jim

Last edited by Earthworm Jim; 05-01-2010 at 10:19 PM. Reason: forgot something
Earthworm Jim is offline   Reply With Quote
Old 05-01-2010, 11:37 PM   #7
Commercial Roofing
 
AaronB's Avatar
 
Join Date: Jan 2005
Location: Illinois
Posts: 927
Rewards Points: 500
Default

Roof for Garage-Nursery


A vapor barrier is anything less than 1 perm. .75 is less than one. The smaller the number with water vapor transmission, the better.
__________________
www.roseroofing.net/ Free inspection within 12 miles
Seamless Polyurea Roofing Membranes for Metal Roofing, Roof Leak Repair, Seamless Commercial Spray Foam Insulation, Seamless Commercial Roofing, SPF Roofing, Industrial Insulation, Our trucks are red but our roofing is GREEN!
AaronB is offline   Reply With Quote
Old 05-01-2010, 11:55 PM   #8
Member
 
Join Date: Oct 2009
Location: Freeport, ME USA
Posts: 120
Rewards Points: 75
Default

Roof for Garage-Nursery


v.b. paint is vapor barrier paint -- it is manufactured by a few different companies and I believe comes in different perm ratings. Perm ratings being the ability water vapor to pass through a materiel. It should have a perm rating of less than 1.0
meboatermike is offline   Reply With Quote
Old 05-02-2010, 12:02 AM   #9
Commercial Roofing
 
AaronB's Avatar
 
Join Date: Jan 2005
Location: Illinois
Posts: 927
Rewards Points: 500
Default

Roof for Garage-Nursery


I feel obliged to add that GBR was correct. I do not believe that a perm rating that low would be needed unless you are running a sauna in Antarctica though, or an ice house in Ecuador.
__________________
www.roseroofing.net/ Free inspection within 12 miles
Seamless Polyurea Roofing Membranes for Metal Roofing, Roof Leak Repair, Seamless Commercial Spray Foam Insulation, Seamless Commercial Roofing, SPF Roofing, Industrial Insulation, Our trucks are red but our roofing is GREEN!
AaronB is offline   Reply With Quote
Old 05-02-2010, 12:07 AM   #10
Commercial Roofing
 
AaronB's Avatar
 
Join Date: Jan 2005
Location: Illinois
Posts: 927
Rewards Points: 500
Default

Roof for Garage-Nursery


One more thing... you should be just fine as far as vapor transmission and temperature control with 2-3 inches of closed cell spray foam alone on the walls and ceiling/roof. No additional coatings would be needed nor additionally beneficial.

__________________
www.roseroofing.net/ Free inspection within 12 miles
Seamless Polyurea Roofing Membranes for Metal Roofing, Roof Leak Repair, Seamless Commercial Spray Foam Insulation, Seamless Commercial Roofing, SPF Roofing, Industrial Insulation, Our trucks are red but our roofing is GREEN!
AaronB 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
Need opinion on this roof profenx Roofing/Siding 14 10-12-2010 01:56 AM
Putting a new flat roof on a 3600 sf home Jean3 Off Topic 2 04-09-2010 01:35 AM
The moving Ice Dams after using a roof rake ?? Canufixit Roofing/Siding 9 02-05-2009 08:33 PM
Flat roof questions, advice, ballpark estimate JerryH Roofing/Siding 18 11-07-2008 05:08 PM
Flat roof - Rolled? - leaks Advice? JJ2001 Roofing/Siding 4 11-19-2006 07:17 AM




Top of Page | View New Posts

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