Cedar Siding Over Asbestos

A brief history of asbestos cement siding.

Cedar siding over asbestos.

If the job had been done right the house would have been a total loss. The portland cement binds asbestos fibers into a hard mass. A common remodeling practice is to install new vinyl or aluminum siding over cement asbestos shingle siding as well as over many other older siding materials when the old siding has become damaged leaky or cosmetically ugly. Asbestos shingles are relatively strong but.

Alternatively if you leave the asbestos on your home you can safely seal the old siding underneath the new siding and because asbestos is an excellent insulator you will actually be adding to the energy efficiency of your home by leaving it on. Removing asbestos is often cost prohibitive for most people. Applying a layer of sheathing or sheets of foam insulation over the asbestos then covering it with vinyl siding is a common practice. Asbestos cement is a mixture of portland cement reinforced with asbestos fibers.

If the siding cedar or hardboard is in good shape and the substrate is wood it is foolish to remove the old siding. Was the problem that they put new siding over old or that they put new siding over a rotted wall with no drainage plain in between. Asbestos cement was first developed in 1905 by the johns manville company who became one of the premier manufacturers of cement asbestos materials. But be sure to check your local building codes first to see if it is allowed in your area.

It also eliminates the problem of mold forming when insulation is attached directly to the substrate. I ve seen house fires where the vinyl siding burned off only to reveal the superior asbestos shingles underneath which saved the house. However removing the asbestos siding first though more expensive is the best alternative in the long run. Asbestos was banned in 1989 so as the buildings that incorporated it age their roofing and siding will fall into disrepair.

Nail it in place using several nails a few inches apart until the top of the plastic is fully attached. Asbestos siding in particular however has a tendency to chip crack and break with normal wear and tear of family life. This can release fibers into the air. Lead paint wasn t outlawed until 1978 so it s sure to be present on siding going back to the 1950s.

Guide to siding over asbestos cement siding. Many asbestos roofs and siding are damaged cracked or broken. The plastic is used to create a barrier to the elements as well as prevents the siding from rubbing against the painted asbestos siding. Going over the existing siding adds to the r value by creating an air space between the insulation and old siding.