No Tyvek Under Siding

During a recent repair to our siding we found that the house had no building wrap tyvek under the siding.

No tyvek under siding.

This explains why the house does not retain heat. One would be to remove the siding wrap the house and then reside it. Exterior walls are 1 2 plywood w tyvek housewrap. Dupont tyvek goes on the wood sheets and is covered up by a waterproof siding shingles.

Take the tyvek off and start over with a better detail i typically. 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. I have been asked to advise whether to 1. If tyvek is a good idea or not depends on where you are.

Even at wind speeds of 5 mph a wall without an air barrier retains less than 40 of its original installed r values. 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. Installing foam board insulation under vinyl siding today. Vinyl siding is one of if not the most popular exterior cladding for residential homes.

It seems that we have two options. House under construction in coastal zone 3 2 story 2x6 wood framed. The irc 2000 code and our building dept. Faq s acronym s terminology to tyvek or not to tyvek that is the question.

Use tyvek over building felt under siding. 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. 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. However properly installed tyvek weather barriers help protect against loss of r value in insulation due to wind washing.

The wood that goes under residential siding exterior sheathing performs several functions. It is waterproof but allows smaller water vapor droplets through. Tyvek is like goretex a la mountain jackets but for houses. It adds insulation waterproofing and structural support for the framing.