Siding Installing siding

Published on August 18th, 2016 | by Henri


Preparing a house for vinyl siding

Q. I am having a cultured stone exterior on the front portion of my house removed, and replaced with vinyl siding mainly due to water penetrating the interior walls during driving rain storms. It is a problem I have been experiencing for some time and I suspect due to either inadequate flashing around the overhang, and/or mortar breakdown. Also, the rooms on the inside of the stone front are always noticeably colder during the winter.

My question is when I suggested to the contractor that in addition to inspecting and/or replacing the flashing after the stone has been removed, that he use the Tyvek product on the barren plywood to both insulate and provide a suitable vapor barrier. Do you agree?

A. Tyvek does not insulate and is not a vapor barrier; it has a high permeance to let vapor that may build up on its warm side escape to the outside. The vinyl industry specifies that a water-repellent membrane must be applied underneath vinyl siding because vinyl siding is not waterproof. Since the rooms in question are noticeably colder, you may want to consider having 1-inch thick rigid extruded polystyrene insulation (XPS – Styrofoam, FoamulaR or equivalent) or polyiso rigid insulation put over the Tyvek. This should really help making the rooms warmer.

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