ex army or ready made body options in the eastern block?

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Brian-reynolds
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Re: ex army or ready made body options in the eastern block?

Postby Brian-reynolds » Wed Mar 25, 2020 5:33 pm

PeteB wrote:1) External fibreglass skin
2) Nida core (or similar) honeycomb from Omnia
3) Styrofoam (or similar) insulation added by you to pack out the air gap
4) GRP layer
5) Ply lining
6) Inner RTM (Resin Transfer Moulding?) skin


Err not quite.....

CVR make the GRP-ply-RTM panels that I used
CVR make the GRP-Ply-RTM-Ply-GRP that Steve, and most people use.
Omnia make the, err, Omnia panel

I had the cabin made from the Omnia panels, which I bonded the outer GRP sheet to.
I then inserted the CVR panel inside the cabin and bonded that to the inside of the Omnia panel. which then gave me as follows, from the outside...
GRP-Omnia-RTM-Ply-GRP which is 5 layers total.

Picture is of the Omnia on it's own....
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PeteB
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Re: ex army or ready made body options in the eastern block?

Postby PeteB » Wed Mar 25, 2020 7:19 pm

OK, got it Brian. Thanks for your patience. I think I'm concluding the standard single-supplier panel route is easiest and will do the job! Still plenty to think about in terms of materials and whether to try and get studwork or cable runs inlaid.

One final query, what does RTM stand for in this context?
Brian-reynolds wrote:CVR make the GRP-Ply-RTM-Ply-GRP that Steve, and most people use.

It is all keeping me amused and getting the brain working whilst I cannot look for trucks, if nothing else. This learning will come in useful later.

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Brian-reynolds
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Re: ex army or ready made body options in the eastern block?

Postby Brian-reynolds » Wed Mar 25, 2020 7:34 pm

PeteB wrote:OK, got it Brian. Thanks for your patience. I think I'm concluding the standard single-supplier panel route is easiest and will do the job! Still plenty to think about in terms of materials and whether to try and get studwork or cable runs inlaid.

One final query, what does RTM stand for in this context?
Brian-reynolds wrote:CVR make the GRP-Ply-RTM-Ply-GRP that Steve, and most people use.

It is all keeping me amused and getting the brain working whilst I cannot look for trucks, if nothing else. This learning will come in useful later.


I have absolutely no idea what RTM stands for.... I have only just found out that is what it is called myself!

The complete sandwich is the way to go, and if/when I get round to building my next truck, that is how I am going to build it, no question.

As for getting cable runs installed, no way, keep them where you can easily get to them, pus that way you do not loose the thermal barrier that the RTM is....
Even putting battens in for strength, can sometime be visible in the cold weather in my truck, only just and very rarely, but can still be seen in the ceiling panels...

Have everything that will ever need servicing, easily accessible.. plenty of ways of hiding cables, including some very nicely shaped small conduit.

crinklystarfish
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Re: ex army or ready made body options in the eastern block?

Postby crinklystarfish » Thu Mar 26, 2020 7:35 am

'RTM' comes from Styrofoam RTM, which is perhaps the best known brand of extruded polystyrene in the caravan industry.

RTM is thrown about a bit casually, 'XPS' (short for extruded polystyrene) is perhaps a better universal term. Or, the foamy bit.

Echoing the advice in the book and from Brian above - it's always best to be route cables, plumbing, heating duct etc where it can be accessed and serviced.

PeteB
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Re: ex army or ready made body options in the eastern block?

Postby PeteB » Thu Mar 26, 2020 1:13 pm

crinklystarfish wrote:'RTM' comes from Styrofoam RTM
Thanks Steve - stops Brian & I wondering. The stuff is now branded Ravatherm XPS and they seem to be dropping the styrofoam name.

Will follow the guidance on ducting/piping. Just about to get my head around calculating heating requirements next. This work from home regime has some benefits in terms of multi-task researching.


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