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.

It is waterproof but allows smaller water vapor droplets through. Exterior walls are 1 2 plywood w tyvek housewrap. 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. It seems that we have two options.

However properly installed tyvek weather barriers help protect against loss of r value in insulation due to wind washing. If tyvek is a good idea or not depends on where you are. Tyvek is like goretex a la mountain jackets but for houses. 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.

It adds insulation waterproofing and structural support for the framing. Even at wind speeds of 5 mph a wall without an air barrier retains less than 40 of its original installed r values. Faq s acronym s terminology to tyvek or not to tyvek that is the question. Installing foam board insulation under vinyl siding today.

Use tyvek over building felt under siding. House under construction in coastal zone 3 2 story 2x6 wood framed. 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. 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.

I have been asked to advise whether to 1. One would be to remove the siding wrap the house and then reside it. Take the tyvek off and start over with a better detail i typically. The wood that goes under residential siding exterior sheathing performs several functions.

Roofing felt seals around the nail after it heats up. This explains why the house does not retain heat. Vinyl siding is one of if not the most popular exterior cladding for residential homes. The irc 2000 code and our building dept.