Journey with Confidence RV GPS App RV Trip Planner RV LIFE Campground Reviews RV Maintenance Take a Speed Test Free 7 Day Trial ×


Reply
 
Thread Tools Display Modes
 
Old 10-19-2021, 08:19 PM   #1
New Member
 
Join Date: Oct 2021
Posts: 2
Insulation thickness and furring strips

Hi guys,

I'm using 1x2 furring strips for my subfloor and didn't think ahead to check the available thicknesses at Home Depot. I ended up having to go with 1" polyiso. This is leaving about a 1/4” gap between the top of the furring strip and the top of the insulation boards (insulation being taller than the furring strips). Should this cause any issues?

I thought about ripping down some of the scrap 1x2's and cutting them into a bunch of spacers that I can glue on top of the furring strips to support the top layer of plywood once I lay that down. Not sure if that is necessary?

Any thoughts would be greatly appreciated!

Mikethebuilder is offline   Reply With Quote
Old 10-20-2021, 09:17 AM   #2
Bus Nut
 
Join Date: Oct 2016
Location: Pensacola and Crystal River, FL
Posts: 647
Year: 1998
Coachwork: AmTran International
Chassis: 3800
Engine: Navistar 7.6L
I would add another 1/4"
Rip a 2x4 into slats, rip up all your drops and lay the on the 1x2's.
Tack each slat down just enough to keep it in place until the plywood is on and screwed down.
Besure you use right length plywood screws
DoubleO7 is offline   Reply With Quote
Old 10-20-2021, 10:27 AM   #3
Bus Crazy
 
Join Date: Apr 2020
Location: Northern California (Sacramento)
Posts: 1,416
Year: 1999
Coachwork: El Dorado Fiberglass
Chassis: Ford E450
Engine: V10 Gas
Quote:
Originally Posted by Mikethebuilder View Post
Hi guys,

I'm using 1x2 furring strips for my subfloor and didn't think ahead to check the available thicknesses at Home Depot. I ended up having to go with 1" polyiso. This is leaving about a 1/4” gap between the top of the furring strip and the top of the insulation boards (insulation being taller than the furring strips). Should this cause any issues?

I thought about ripping down some of the scrap 1x2's and cutting them into a bunch of spacers that I can glue on top of the furring strips to support the top layer of plywood once I lay that down. Not sure if that is necessary?

Any thoughts would be greatly appreciated!
The issue will be that your screws will pull through your flooring when you try to send them home tight; or, the floor will squeak because the fastener couldn't cinch the two pieces of wood tight.

The fix would be to include a spacer on the furring strips. Could be 1/4" ply or even masonite (I'd stick to plywood). Make sure the furring strips stand proud (higher than) the insulation, otherwise you may see a dip in the finished floor wherever two pieces of subfloor meet.

Best practice is to glue everything down, even if you just use a thin bead of adhesive.
Rucker is offline   Reply With Quote
Old 10-20-2021, 06:12 PM   #4
Bus Geek
 
musigenesis's Avatar
 
Join Date: Jan 2019
Location: Philadelphia
Posts: 6,992
Year: 2003
Coachwork: International
Chassis: CE 300
Engine: DT466e
Rated Cap: 65C-43A
You could also put strips of 1/4" XPS foam board on top of your furring strips, which would come up flush with the 1" polyiso. This would provide a bit of a thermal break between the wood of the furring strips and the plywood.
__________________
Rusty 87 build thread
musigenesis is offline   Reply With Quote
Old 10-20-2021, 07:12 PM   #5
Bus Crazy
 
DeMac's Avatar
 
Join Date: Oct 2020
Location: Florida
Posts: 1,554
Coachwork: Integrated Coach Corp.
Chassis: RE-300 42ft
Engine: 466ci
Rated Cap: 90
Quote:
Originally Posted by musigenesis View Post
You could also put strips of 1/4" XPS foam board on top of your furring strips, which would come up flush with the 1" polyiso. This would provide a bit of a thermal break between the wood of the furring strips and the plywood.

Owens Corning makes a product called Fanfold using their Foamular XPS formula. It comes in 1/4" thickness (R-1) with 10psi compression strength.

It's generally intended for application as a backer board for residing applications where it provides a flat uniform surface.

The price is not bad for the amount of material provided and it's already the correct thickness. One piece is 4'x50' (fan folded).

Insulation Supply is a wholesaler/retailer, located in Ohio.
https://insulation.supply/product/fa...esiding-board/
Attached Thumbnails
Screenshot_20211020-200428_Chrome.jpg  
__________________
Ceiling: Framing & Electrical Rough-in
Convert Hatch to AC & Roof Patch
🇺🇸 Frederick Douglass: "If there is no struggle, there is no progress.”
DeMac is offline   Reply With Quote
Old 10-21-2021, 09:11 PM   #6
New Member
 
Join Date: Oct 2021
Posts: 2
Thanks for the replies! I ended up ripping down some 2x4's and used liquid nails to attach them to the top of the existing furring strips and tacked them down. It seems to have done the trick!
Mikethebuilder is offline   Reply With Quote
Old 10-31-2021, 07:34 AM   #7
Bus Nut
 
Join Date: Jun 2021
Location: Baja often, Oregon frequently
Posts: 427
Year: 1996
Coachwork: Our hot little grubbies...
Chassis: Ford CF8000 ExpeditionVehicle
Engine: Cummins 505ci mechanical
Rated Cap: Five Heelers
My motto:
* Simpler is better.
.
2003, for our ExpeditionVehicle, I set one-inch pink-board on the box floor.
Over that, I set half-inch plywood... painted to seal on all surfaces.
The visible floor is slate in the center, bamboo tongue-n-groove plank around the perimeter.
.
Nearly two decades full-time live-aboard, the pink-board shows zero-zero-zero signs of crush or crumble.
.
If we were Perfessioneral Snowboarder types living in a freezer, I might double that one-inch pink-board.
So far, this is working just fine.
LargeMargeInBaja is offline   Reply With Quote
Reply

Tags
floor, insulation, subfloor

Thread Tools
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


» Featured Campgrounds

Reviews provided by

Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 04:43 AM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2024, vBulletin Solutions, Inc.