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Post by Warrenk on Oct 3, 2017 22:11:56 GMT 10
Has anyone used closed cell foam to seal window frames to the body of the caravan instead of butyl mastic?
Warren
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Post by Roehm3108 on Oct 3, 2017 23:26:32 GMT 10
Why would you do that? It dries out in the sun and will crack under the stress of movement as well. You sound like you have another reason for wanting to use it.
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Post by Warrenk on Oct 4, 2017 9:32:54 GMT 10
With Butyl mastic only having about a 10 year lifespan as a good sealant and with improved ways of doing things there may be a better option these days than what been used in the past. The glazing industry now use glazing closed cell foam, all new caravans use this foam around the windows( and the windows are one of the areas on modern caravans that don't leak). If you take a caravan to a repairer to have a window resealed(the original sealant will more than likely be butyl mastic) the new seal they use will be glazing foam. This foam only needs 20% compression to form a water tight seal. The foam is sandwiched between the window frame and caravan body and should never be exposed to the sun. You will probably find the glazing foam is UV stabilised.
I am serious considering using glazing fom when I reseal the windows in my Olympic.
Warren
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Post by Roehm3108 on Oct 5, 2017 21:32:27 GMT 10
Thanks for the info, Warren. This material may well have uses in aluminium framed windows. I don;t know of what traps there may be with the foam or what its life expectancy could be. It would concern me a little if it can't be exposed to direct sun as you say and do wonder what effect the sort of heat a parked van builds up in summertime, would have on this material.
I would caution against discarding butyl mastic as a sealer. This product too has been improved over the years, so that it is more durable and has a longer effectiveness period than 10 years.
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Post by Mustang on Oct 7, 2017 9:14:56 GMT 10
I can see the path Warrenk is treading here with time alone.
I sealed 16 windows in our Viscount using ribbon mastic on a roll & it took months. (to date no leaks or deterioration of the mastic)
Looking back if I was able to spray something or apply a tape on the cladding, screw the window into place knowing all voids were filled?, quick clean up & done,
could it be this simple ??
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