Vinyl Siding With Tyvek Over Existing Lap Siding

The guy i have installing my vinyl siding just placed the foam over the old tyvek is that ok or should he have removed it first.

Vinyl siding with tyvek over existing lap siding.

Why siding over existing siding is a bad move yes you may be able to save some money by not removing the old siding but that old siding could be hiding problems that may bite you down the road. I have seen some bad reactions with tyvek over felt i thought. Going over the existing siding adds to the r value by creating an air space between the insulation and old siding. On the other hand brick stucco and other masonry based sidings can be used with house wrap but your builder will need to use the right type.

Many homeowners choose vinyl siding because it is relatively inexpensive easy for a do it yourselfer to install resists insects and rot and never needs. Generally the best idea is to remove any existing siding from your exterior walls before installing the vinyl siding. Using existing siding for replacing siding the best place to start is to closely examine the existing siding to get a good understanding of what condition it is actually in. These products are designed primarily to pad imperfections on the walls so the new layer of siding will lay flatter.

Left unchecked small issues can become major problems that could end up costing thousands of dollars to rectify. It also eliminates the problem of mold forming when insulation is attached directly to the substrate. You might want to read the article in jlc march 2006 page 99. Siding that s assembled from large panels such as vinyl or aluminum cladding also makes a good candidate too since water can enter through cracks where the pieces are joined.

One would be to remove the siding wrap the house and then reside it. According to the best practices manual from james hardie existing siding can be used as a substrate as long as it is in good condition meaning that it is not warped. This goes for fiber cement hardwood and masonite siding. Never never never let a contractor remove your old siding and install a tyvek material with insulation over the top.