by m12.boston.juno.com (queuemail) id LOQ20390; Wed, 16 Jul 1997 11:15:25 EDT
Subject: COZY: Firewall foam
From: cozybldr@juno.com (Paul T Stowitts)
Date: Wed, 16 Jul 1997 11:15:25 EDT

Does anyone know if 1/4" PVC can be substituted for Clark (Last-a-foam)
for the firewall fill-in piece?  I have extra PVC that I could use. 
Thanks.

Paul Stowitts
Cozy Mark IV #200

 
 
Date: Wed, 16 Jul 1997 21:27:23 +0200
From: Jean-Jacques CLAUS <fpjjc@hol.fr>
Subject: Re: COZY: Firewall foam

Paul T Stowitts wrote:
> 
> Does anyone know if 1/4" PVC can be substituted for Clark (Last-a-foam)
> for the firewall fill-in piece?  I have extra PVC that I could use.
> Thanks.
> 
> Paul Stowitts
> Cozy Mark IV #200


You can use a scrap of low density PVC foam at these places.
I made it on my firewall.
The foam inserted area of the firewall is in contact with the center
spar then there are non-structural efforts here. The foam is lighter
than plywood so we win weight with the firewall cut out.

About foam replacement, it is possible to replace the URETHANE by H60
PVC ( chap.14 ( center spar )for example ).
The urethane was choosen because it is easier to work than PVC. But we
must know that urethane foam is not time resistant. In about 10-15 years
this foam become dusty.

The density must be the first choice criteria. Often in the COZY
construction method, the foam is only a lost mold.


Jean-Jacques CLAUS - French Builder
COSY CLASSIC - #CC1056
fpjjc@hol.fr