Building Paper Under Siding

Use tyvek over building felt under siding.

Building paper under siding.

Thd sku 154661. Install pieces in the correct order and make cuts carefully so any moisture can travel downward at all points without slipping under the wrap. Nowadays low cost 15 felt can weight as little as 8 to 12 pounds per square 100 sq. Felt paper also commonly referred to as tar paper is an underlayment material applied to bare walls before siding is installed.

In fact many builders disagree on the effectiveness of house wraps altogether and while some builders will only install 15 pound asphalt saturated felt paper underneath exterior siding others swear by plastic fabric house wraps such as typar or tyvek. Fortifiber 2 ply 162 sq. This means for example having to slit the housewrap above windows to tuck under the upper leg of a metal cap flashing then taping the wrap to the flashing. I saw a new house with felt paper under the siding rather than tyvek.

Install flashings metal self adhesive or both as recommended by the window or door manufacturer or as required by local codes. Moisture will find its way into these wall systems by way of cracked mortar joints gaps or cracks in the surface of the material. The standard weather barrier used traditionally under wood vinyl and other siding materials is 15 pound felt. Protects against water intrusion.

When building exterior walls with stone stucco brick when building exterior walls with stone stucco brick cedar eifs or fiber cement siding it is important to use an effective rain screen system that will provide a means for drainage and ventilation. I have seen literally hundreds of houses stripped of asbestos siding that had 15 felt under it. 60 minute building paper for use behind exterior wall cladding including stucco fiber cement siding brick vinyl and wood siding. I ve opened up houses built less than 5 years previous and the tyvek was shreaded like old newspaper.

Felt or building paper must be applied to walls properly to be effective. Should any water get past the siding properly installed felt. Typically building paper is installed as soon as the sheathing is installed. I ll stick with tried and true felt paper.

Faq s acronym s terminology to tyvek or not to tyvek that is the question. Perhaps recent damage to their siding showed no house wrap under their vinyl or they are working with a contractor who doesn t believe house wrap to be necessary. For stucco the standard is two layers of grade d building paper. They were built in the 1950s and 60s the felt was in perfect condition.