[MassHistPres] water vapor

[Tristram Metcalfe]

With a water proof skin over any historic material that can oxidize mold or
deteriorate in high humidity, you certainly should insist on adding or
maintaining removal of trapped water vapor. It can be done by natural
thermal and or wind pressures.

That new thick paint skin may be good at keeping water out of some
conditions,, possibly logical on high inaccessible areas, towers or a
steeple that is well ventilated.

Any wood butt joints or surfaces layered tightly anywhere [worst case
horizontal] need ventilation even if details to keep it dry exist. Water
goes anywhere that wind or gravity move it including straight up hill in
high wind.

Tris 
Northampton

Steinitz, Michael @ SEC4/11/06 9:35 AMMichael.Steinitz at state.ma.us

> Eric,
> 
> These products, which seem to be more heavily marketed in other regions of
> the country, have come up for discussion in the past on national
> preservation list-servs. As with many products, manufacturers claims should
> be regarded with much skepticism.  Think of it as spraying on the equivalent
> of 10 coats of thick, non-reversible paint at one time.  Some historic
> district commissions around the country have prohibited the use of liquid
> vinyl and similar products. While I have not seen specific independent data
> on long term problems with the use of this product, it's hard to imagine
> that applying this to a building would be a good thing.
> 
> Michael
> 
> Michael Steinitz
> Director, Preservation Planning Division
> Massachusetts Historical Commission
> 220 Morrissey Blvd, Boston MA 02125
> 617-727-8470, 617-727-5128 (fax)
> michael.steinitz at state.ma.us
> 
> 
> -----Original Message-----
> From: masshistpres-bounces at cs.umb.edu
> [mailto:masshistpres-bounces at cs.umb.edu]On Behalf Of Eric Dray
> Sent: Monday, April 10, 2006 10:56 AM
> To: HDC Listserv
> Subject: [MassHistPres] (no subject)
> 
> 
> The NR-listed Universalist Meeting House of Provincetown is considering
> using liquid vinyl on its steeple (www.liquidvinylsystem.com
> <http://www.liquidvinylsystem.com/> ), installed in New England by Permacoat
> New England (www.permacoatnewengland.com
> <http://www.permacoatnewengland.com/> ).  It is promoted as being similar to
> paint in appearance, but essentially a permanent coating of liquid vinyl.
> It expands with the temperature, and is touted as being more breathable than
> paint.  They have asked for my opinion.  I am rather skeptical, but was
> wondering is anyone has actually used it on an historic building.
> 
> 
> 
> Eric Dray
> 
> Chair, Provincetown Historical Commission
> 
> 
> 
> _______________________________________________
> MassHistPres mailing list
> MassHistPres at cs.umb.edu
> http://mailman.cs.umb.edu/mailman/listinfo/masshistpres
> _______________________________________________
> MassHistPres mailing list
> MassHistPres at cs.umb.edu
> http://mailman.cs.umb.edu/mailman/listinfo/masshistpres