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73-87 Chevy _ GMC Trucks => Body, Glass & Paint => Topic started by: Ds2014 on December 28, 2014, 11:42:07 am

Title: Heater box seal
Post by: Ds2014 on December 28, 2014, 11:42:07 am

I have an 81 step side short wheelbase under restoration,what do I use to seal the heater box back to the firewall?


                                        Thanks Don

Title: Re: Heater box seal
Post by: Blazin on December 28, 2014, 08:13:54 pm

I have used butyl tape like what they used to use to install windshields. I have also used the two sided urethane foam tape that is used for metal roofing. You lay it on top of the rib that is to be overlapped by the next sheet / panel of metal.

Title: Re: Heater box seal
Post by: ehjorten on January 05, 2015, 08:57:46 am

I got a roll of 3/8" round butyl rubber and used that.

Title: Re: Heater box seal
Post by: Ds2014 on January 05, 2015, 10:31:52 am

Where did you get it?

Title: Re: Heater box seal
Post by: ehjorten on January 05, 2015, 11:34:59 am

I got it from a local windshield repair supply house.  They actually just gave me the roll!

Title: Re: Heater box seal
Post by: ehjorten on January 05, 2015, 11:43:05 am

Looks like RV Wholesalers has some rolls.  Doesn't really matter if it is round or flat.  The 3/8" round that I had was a little thick.  I needed to squish it down a lot.  A flat strip of 3/16" x 3/4" or 1" would probably work well.

Title: Re: Heater box seal
Post by: Ds2014 on January 05, 2015, 05:45:30 pm

Cool thanks

Title: Re: Heater box seal
Post by: Blazin on January 06, 2015, 09:31:10 am

Your local lumber yard has the urethane roofing tape.