0 Helpful?

New siding over two existing layers

I'm looking to install new vinyl siding. The house was built in the late 40's and has currently has two layers of siding on it. The top layer is cedar board and batten. The second layer is clapboard, but I'm not sure of the material type.

I've met with three contractors. One wants to remove both layers while the other two were planning to side over both of the existing layers removing only the batten. The last contractor went back and forth before deciding that siding over both layers would be ok.

It seems to be common practice to side over an existing layer over siding. However I can't seem to find any information about installing a third layer of siding.

Am I asking for trouble by installing a third layer of siding vs. removing one or both layers of the existing siding?

Asked by Chris Maida
Posted Sep 21, 2011 10:42 PM ET

Tags:

1 Answer

Select your preferred way to display the comments and click "Save settings" to activate your changes.
1.

Chris,
I don't think there are any building-science reasons why the existing siding layers have to be removed. The main questions are:

1. Are the underlying layers of siding sound, without any rot or soft spots? Are they well fastened? If so, you can install more siding over them if you want.

2. Do you object to the fact that each successive layer of siding thickens your wall, creating trim problems at doors and windows? Eventually, your windows and doors will get a sunken appearance, considered unattractive by most observers.

If it were my house, I would strip the existing siding down the the sheathing. That would allow the sheathing to be inspected for problems. It would also make it easier to install a water-resistant barrier (WRB) and proper flashing. It might also allow you to install a layer of rigid foam between the sheathing and the new siding.

Answered by Martin Holladay
Posted Sep 22, 2011 4:11 AM ET
Edited Sep 22, 2011 4:12 AM ET.

Other Questions in General questions

What should I replace my heating and cooling system with?

In Mechanicals | Asked by Jill D | Jan 17, 18

Heat Pump +/- gas furnace

In Mechanicals | Asked by Kevin Spellman | Jan 17, 18

Bathroom remodel, question on wall construction and shower area

In General questions | Asked by David B | Jan 18, 18

Another try at a ceiling service cavity framing

In Energy efficiency and durability | Asked by Jerry Liebler | Jan 15, 18

Basement Insulation question

In Green products and materials | Asked by bullet0770 | Jan 17, 18
Register for a free account and join the conversation


Get a free account and join the conversation!
Become a GBA PRO!