Insulation: Walls AND Floors?

Anything to do with mechanical, construction etc

Insulation: Walls AND Floors?

Postby Stancaban » Sun Jan 28, 2018 12:07 pm

Hi there, new to the forum but really enjoying all of the content so far. I’m currently drawing up plans for a small camping trailer, not tear drop but more rectangular. My current plan has an insulated floor (just foam insulation sheets from Home Depot) and the same in the 2 side walls since those are the largest surface areas. My front wall is just a single sheet of 3/4” and my back wall is too.

I wanted to hear thoughts on what you all have done and where you stand on insulating these things. It’s a small 4x8 harbor freight trailer as the base btw.

Thanks!


Sent from my iPhone using Tapatalk
User avatar
Stancaban
Teardrop Inspector
 
Posts: 3
Joined: Mon Jan 22, 2018 4:08 pm

Re: Insulation: Walls AND Floors?

Postby tony.latham » Sun Jan 28, 2018 4:35 pm

I'm in the camp that believes that if you are losing heat through a teardrop floor, your mattress isn't thick enough.

Having said that, If I build #4––and I'm toying with it––I'll build the floor using a 1" x 4" framework filled with hard foam and sheathed on both sides with 1/4" subfloor plywood. The foam will be for stiffness, not insulation.

Image

I want some meat to attach the walls too. :thumbsup:

And walls and ceiling? I want them insulated. Otherwise, you'll get condensation.

Image

Image

Tony
Image
User avatar
tony.latham
Gold Donating Member
 
Posts: 2751
Images: 17
Joined: Mon Jul 08, 2013 4:03 pm
Location: Middle of Idaho on the edge of nowhere

Re: Insulation: Walls AND Floors?

Postby Esteban » Sun Jan 28, 2018 6:04 pm

I live in the California Central Coast with a mild Mediterranean climate where it seldom freezes. I'm building a 5'4" wide by 10' long Benroy(ish) teardrop trailer. My goal is to keep the completed empty trailer weight under 1,200 lbs. When loaded up with bedding, clothing, food, water and other camping supplies I want to keep the weight under 1,500 lbs. I'm trying to very carefully consider the weight of all the components to best achieve those goals.

My goal is to build a teardrop that will be comfortable while camping in a wide range of weather conditions whether it's hot, freezing, dry or rainy/wet outside; that substantially reduces interior condensation, and will have better soundproofing than solid plywood does. I'm building the floor, walls, cabin/galley bulkhead, the roof and galley hatch with sandwich construction for those reasons and to better control weight. To get the best insulation value in limited space(s) I'm using rigid Polyisocyanurate (ISO) foam board that has an aged R Value of about 6.5/inch.

The floor will have 3/4" framing and insulation. The side walls will have 1" framing and insulation. The bulkhead will have 3/4" framing and insulation. The roof, galley hatch and front cabin wall will have 1-1/2" framing and insulation so they all will have an insulation value of about R-10.

I'm using 1/8" plywood inside and (Baltic Birch) on the exterior. The exterior will be completely fiberglassed to strengthen and water proof the thin exterior plywood skin. The outsides will be painted with white marine paint to protect the fiberglass from UV damage, to better reflect radiant heat, and to look good.

Which Rigid Insulation Should I Use? explains that rigid foam boards vary from about R-4/inch up to R-6.5/inch.
Steve - SLO, CA
Esteban
Donating Member
 
Posts: 1629
Images: 15
Joined: Fri Jul 28, 2006 4:39 pm
Location: California, San Luis Obispo
Top

Re: Insulation: Walls AND Floors?

Postby John61CT » Mon Jan 29, 2018 1:39 pm

All depends on where you plan to camp and what sort of climate control you plan to use.

For me, against cold using propane heat, 4" roof, 3" walls, 2" floor.

Reversed if heat is the problem using genny- powered A/C.

For both 3" all 'round.

And don't just look at R-value, you want as completely sealed an envelope as possible.

For those following the 60's and used to a little discomfort, none at all is required.
John61CT
500 Club
 
Posts: 808
Joined: Thu Nov 17, 2016 4:36 pm
Top

Re: Insulation: Walls AND Floors?

Postby Tom&Shelly » Mon Jan 29, 2018 6:37 pm

tony.latham wrote:I'm in the camp that believes that if you are losing heat through a teardrop floor, your mattress isn't thick enough.

Having said that, If I build #4––and I'm toying with it––I'll build the floor using a 1" x 4" framework filled with hard foam and sheathed on both sides with 1/4" subfloor plywood. The foam will be for stiffness, not insulation.


Hi Tony,

Why 1" x 4" instead of skeletonizing 3/4" plywood? Thought you said you had problems using 1-by as a framework for the walls on your first build. Would the 1" x 4" cause the same problems with the floor?

I'm designing mine right now, and appreciate the experienced advice!

Tom
Tom&Shelly
Palladium Donating Member
 
Posts: 140
Images: 86
Joined: Tue Sep 05, 2017 3:27 pm
Location: New Mexico
Top

Re: Insulation: Walls AND Floors?

Postby daytimer » Mon Jan 29, 2018 7:14 pm

Fwiw... I'm looking at the Big Woody plans and they have the side walls as 3/4 laminated plywood, with insulation on the floor and ceiling. So I'm equally interested in input.


Sent from my SM-G950U using Tapatalk
daytimer
Teardrop Inspector
 
Posts: 4
Joined: Sun Nov 19, 2017 5:31 pm
Top

Re: Insulation: Walls AND Floors?

Postby John61CT » Mon Jan 29, 2018 9:10 pm

Wow talk about heavy!
John61CT
500 Club
 
Posts: 808
Joined: Thu Nov 17, 2016 4:36 pm
Top

Re: Insulation: Walls AND Floors?

Postby tony.latham » Mon Jan 29, 2018 9:29 pm

Why 1" x 4" instead of skeletonizing 3/4" plywood? Thought you said you had problems using 1-by as a framework for the walls on your first build. Would the 1" x 4" cause the same problems with the floor?


Tom:

I certainly recommend 3/4" ply for the skeleton walls. Much less labor than joining numerous chunks of 1 x 4s.

However, the floor is a different critter. It's all 90º angles. Screw and glue 1/4's to the plywood. It's quick. No joinery.

Tony
Image
User avatar
tony.latham
Gold Donating Member
 
Posts: 2751
Images: 17
Joined: Mon Jul 08, 2013 4:03 pm
Location: Middle of Idaho on the edge of nowhere
Top

Re: Insulation: Walls AND Floors?

Postby aggie79 » Tue Jan 30, 2018 8:52 am

tony.latham wrote:
Why 1" x 4" instead of skeletonizing 3/4" plywood? Thought you said you had problems using 1-by as a framework for the walls on your first build. Would the 1" x 4" cause the same problems with the floor?


Tom:

I certainly recommend 3/4" ply for the skeleton walls. Much less labor than joining numerous chunks of 1 x 4s.

However, the floor is a different critter. It's all 90º angles. Screw and glue 1/4's to the plywood. It's quick. No joinery.

Tony


:thumbsup: for insulating walls, roof & floor.

1/4" ply top and bottom and 1x2s worked fine for me for the floor.

Image

Image
Tom (& Linda)
For more on our Silver Beatle teardrop:
Build Thread

93503
User avatar
aggie79
Super Duper Lifetime Member
 
Posts: 4999
Images: 673
Joined: Tue Aug 07, 2007 5:42 pm
Location: Fort Worth, Texas
Top

Re: Insulation: Walls AND Floors?

Postby sodatrain » Tue Jan 30, 2018 11:25 am

John61CT wrote:.

For those following the 60's and used to a little discomfort, none at all is required.


Hi!

Are there good tools/apps/sites for "following the 60's"? I'm imagining some map or interactive-ish tool to help plan!
--
My 7x7x14 Tandem Axel build thread: viewtopic.php?f=42&t=69731
sodatrain
Teardrop Advisor
 
Posts: 81
Images: 19
Joined: Tue Nov 07, 2017 6:56 pm
Top

Re: Insulation: Walls AND Floors?

Postby Tom&Shelly » Wed Jan 31, 2018 7:26 pm

tony.latham wrote:Tom:

I certainly recommend 3/4" ply for the skeleton walls. Much less labor than joining numerous chunks of 1 x 4s.

However, the floor is a different critter. It's all 90º angles. Screw and glue 1/4's to the plywood. It's quick. No joinery.

Tony


Thank you Tony. and thank you Aggie79 for your comments.

Tom
Tom&Shelly
Palladium Donating Member
 
Posts: 140
Images: 86
Joined: Tue Sep 05, 2017 3:27 pm
Location: New Mexico
Top


Return to Teardrop Construction Tips & Techniques

Who is online

Users browsing this forum: No registered users and 1 guest