Interesting reading about foam core panels.

[ARKPAT]

Here is some food for though ..... ready made http://www.lowes.com/pd_84424-11813-84424_4294858086_4294937087_?productId=3042603&Ns=p_product_prd_lis_ord_nbr|0||p_product_qty_sales_dollar|1&pl=1&currentURL=%2Fpl_Steel%2BDoors_4294858086_4294937087_%3FNs%3Dp_product_prd_lis_ord_nbr|0||p_product_qty_sales_dollar|1&facetInfo= FOAM - CORE STEEL EXTERIOR DOORs for panels. That was my build made from ( sort of the inside French-Door cutouts =) Have you stood on a foam core steel door I have ..... word of advise is use the wood edge doors WITHOUT the LOCKSET CUTOUTS .... they cut and reform easier Check old construction site of renovations ...... you might get a good deal on quantity at a good price



Pat

[aggie79]

Although it's not a foamie, this is what I skinned my teardrop with:

http://www.plywoodcompany.com/application/home/itemdetails.aspx?categoryid=117&itemid=2507

It's a little bit of a premium over the 1/4", 5mm or 5.5mm materials from the BORG, but it's quality is light years ahead of those and it's half the thickness.

[loaderman]

ArkPat any pics of your build?

[ARKPAT]

ArkPat any pics of your build?

Yes ..... look at my Gallery photos of my trailer =)

http://www.tnttt.com/gallery/search.php?st=0&sk=t&sd=d&search_id=usersearch&username=ARKPAT&user_id=2069&start=48



Sorry to be a year late on the post



Pat

[KCStudly]

The mystery car in your album is a TVR (Trevor). Small English sports car with a big lump.

[Bogo]

These are some weights for materials I've been using in some of my weight estimations. I calculated weights per square foot or for foot long lengths for the materials to make calculations easier. Most entries are name, material thickness, then weight per square foot @ material thickness or foot of length. Foams are by cubic foot then 1 inch thick square foot. Tubing thickness is the wall thickness of the tubing. The size of the tubing is in the name. There are some in this list I don't use for the TTT, but they were preexisting in the spreadsheet. I use an index number to point to a material, then all the material's properties are pulled in for the part. In the list of material if I delete a line it messes up the index numbers so unused materials get left in. Most of the material weights have been grabbed from the web.

Weight estimation
Product thickness wt/sq ft
AL tread plate 0.1250" 1.7820 lbs per sq ft
AL tread plate 0.1000" 1.4105 lbs per sq ft
AL tread plate 0.0800" 1.1174 lbs per sq ft
AL tread plate 0.0625" 0.8910 lbs per sq ft

AL Sheet 6061-t6 0.1250" 1.7640 lbs per sq ft
AL Sheet 6061-t6 0.1000" 1.4112 lbs per sq ft
AL Sheet 6061-t6 0.0800" 1.1290 lbs per sq ft
AL Sheet 6061-t6 0.0650" 0.9173 lbs per sq ft
AL Sheet 6061-t6 0.0500" 0.7056 lbs per sq ft
AL Sheet 6061-t6 0.0400" 0.5645 lbs per sq ft
AL Sheet 6061-t6 0.0320" 0.4516 lbs per sq ft
AL Sheet 6061-t6 0.0250" 0.3528 lbs per sq ft

NidaCore 1.0000" 0.9170 lbs per sq ft

Fiberglass Sheets
Filon RBP2 0.0450" 0.3300 lbs per sq ft
Filon RBP2 0.0500" 0.3700 lbs per sq ft
Filon RBP2 0.0600" 0.4400 lbs per sq ft
Filon RBP2 0.0700" 0.5100 lbs per sq ft
From: http://www.cranecomposites.com/_pdfs/75 ... V_Tech.pdf

Plywood
1/8” Baltic Birch 0.1250" 0.4400 lbs per sq ft 11.0000 lbs 5x5 sheet
1/4” Baltic Birch 0.2500" 0.8400 lbs per sq ft 21.0000 lbs 5x5 sheet
3/8” Baltic Birch 0.3750" 1.2800 lbs per sq ft 32.0000 lbs 5x5 sheet
1/2” Baltic Birch 0.5000" 1.7200 lbs per sq ft 43.0000 lbs 5x5 sheet

Flooring
Sheet Vinyl 0.0800" 0.6033 lbs per sq ft
Armstrong Rejuvenations Ambigu StoneRun TimberLine Vinyl Sheet

Commercial weight vinyl 0.1250" 1.3333 lbs per sq ft
Armstrong Standard EXCELON Commercial Vinyl Tiles

Foams lbs cu ft lbs board ft
Foamular 150 1.3000 lbs cu ft, 0.1083 lbs per cu ft.
Foamular 250 1.6000 lbs cu ft, 0.1333 lbs per cu ft.
New England Foam – Cross Linked Polyethylene 2.0000" 0.1667 lbs per cu ft.

Border Wood
Oak 1.0000" 4.1667 per sq ft
Baltic Birch Plywood 1.0000" 3.4400 lbs per sq ft
Southern Yellow Pine 1.0000" 2.5000 lbs per sq ft

Dragon Plate CF/foam/CF
DP CF/Airex/CF 1.0700 0.6300 lbs
DP CF/Diviny Cell/CF 1.0600 0.8900 lbs

Steel box Beam 2x3xX 0.1200" 3.8933 lbs ft
Steel box Beam 2x3xX 0.1875" 5.8899 lbs ft
Steel box Beam 2x3xX 0.2500" 7.6680 lbs ft

a500 Hot Rolled Mild Steel
Steel Box Beam 2x4x 0.1200" 4.7112 lbs per sq ft
Steel Box Beam 2x4x 0.1875" 7.1888 lbs per sq ft
Steel Box Beam 2x4x 0.2500" 9.3720 lbs per sq ft

DOM Tubing
DOM 2” Round 0.1250" 2.5030 lbs ft
DOM 2” Round 0.1875" 3.6300 lbs ft
DOM 2” Round 0.2500" 4.6730 lbs ft

[Lonewolf42301]

With the display of how simple paper and elmer's glue can more than triple the load on the foam, why does everyone get their head wrapped around using heavy materials on the skin such as 1/4 plywood? I've used 1/8" luan on all mine and can walk on it at almost 200 pounds so I'm just confused why people keep using 1/4 and 1/2 in their torsion box builds.

Just what I've been waiting for, someone who used 1/8" material.... Was it strong enuf to walk on with a 5' width in trailer without any bracing under it?

[oakinteriors1]

With the display of how simple paper and elmer's glue can more than triple the load on the foam, why does everyone get their head wrapped around using heavy materials on the skin such as 1/4 plywood? I've used 1/8" luan on all mine and can walk on it at almost 200 pounds so I'm just confused why people keep using 1/4 and 1/2 in their torsion box builds.

Just what I've been waiting for, someone who used 1/8" material.... Was it strong enuf to walk on with a 5' width in trailer without any bracing under it?

Check this out:

As promised I said I would post my results
Material was one and a half inch foam 1/8 inch pressboard out of the bottom of the dresser drawer glued with tb2
Very strong I could put all of my 170 lbs on it with out bending at all then I jumped up and down on it, still fine then I really started to jump up and down on it with only one foot before the top layer broke it took a few more jumps before the bottom layer started to separate at witch point I stopped
Remember that this is only 7 inches wide and two and a 1/2 foot long I have no doubt that this would hold up extremely well if sandwiched between 1/4 inch wafer board OSB

[linuxmanxxx]

With the display of how simple paper and elmer's glue can more than triple the load on the foam, why does everyone get their head wrapped around using heavy materials on the skin such as 1/4 plywood? I've used 1/8" luan on all mine and can walk on it at almost 200 pounds so I'm just confused why people keep using 1/4 and 1/2 in their torsion box builds.

Just what I've been waiting for, someone who used 1/8" material.... Was it strong enuf to walk on with a 5' width in trailer without any bracing under it?

I did a 6' wide by 9' long and 2' galley in the back and framing inside the roof and walls was between 1' to 18" apart with only 3/4" foam and 1x2 stick framing and I walked on the floors of all of them before the roof went on and roof was same 1x2 upright with double 3/4" foam for 1 1/2" and walked on every one of them many times. it's all about the glue on such a large surface on both sides that raises the strengths to such crazy levels. The better the glue bond the higher the stiffness and load it can take.