No Tyvek Under Siding

House under construction in coastal zone 3 2 story 2x6 wood framed.

No tyvek under siding.

During a recent repair to our siding we found that the house had no building wrap tyvek under the siding. This explains why the house does not retain heat. However properly installed tyvek weather barriers help protect against loss of r value in insulation due to wind washing. If this was true than every architect and every builder all over the country should be talking about it and it should be on the plans that you can t use tyvek under cedar.

Faq s acronym s terminology to tyvek or not to tyvek that is the question. I have been asked to advise whether to 1. Owner wants to install vertical metal siding reverse standing seam rustwall over tyvek house wrap and is concerned about the heat build up melting the tyvek. One would be to remove the siding wrap the house and then reside it.

There is no logical reason not to have house wrap under vinyl siding and many authorities strongly agree that it should be viewed as mandatory even if your local building codes don t necessarily require it. The irc 2000 code and our building dept. Tyvek is like goretex a la mountain jackets but for houses. Exterior walls are 1 2 plywood w tyvek housewrap.

Using the wrong materials for your siding not taping off seams in the house wrap or installing a moisture barrier with the strips hung horizontally these can all wind up threatening your sheathing and may potentially cause leaks. Use tyvek over building felt under siding. It adds insulation waterproofing and structural support for the framing. Vinyl siding is one of if not the most popular exterior cladding for residential homes.

It might work before i hand the siding and trim but after that it s swiss cheese. Dupont tyvek goes on the wood sheets and is covered up by a waterproof siding shingles. The barrier prevents wind driven moisture and when a nail is sealed it acts as a much smaller hole then if there was no tyvek. Take the tyvek off and start over with a better detail i typically.

Installing foam board insulation under vinyl siding today. The wood that goes under residential siding exterior sheathing performs several functions. It seems that we have two options. Even at wind speeds of 5 mph a wall without an air barrier retains less than 40 of its original installed r values.