06:19AM | 10/14/04
Member Since: 12/01/02
93 lifetime posts
We are replacing the siding on our house. The existing side is cedar shakes and there is an undercourse of shingles that is some kind of composite particle material. The siding is almost 40 years old. We are going to replace with Hardi-shingle which is a fiber-cement product over Tyvek. The manufacturer does not call for an undercourse and I am wondering if this is still common practice or maybe this is just for true cedar. Does anyone have experience with this?


07:34AM | 10/15/04
Member Since: 01/28/03
693 lifetime posts
Do not use Tyvek over existing composite shingles of siding.

This product is not designed for use this way.

It should be enough to install the Hardie-Shingle over the existing composite siding with no additional barrier beneath at all.

Adding Tyvek over a composite shingle layer is asking for trouble.

But cedar shingles need to 'breath' which is why they are installed over furring strips or 'breather' mesh products.

Not necessary with concrete based sidings.


08:50AM | 10/15/04
Member Since: 12/01/02
93 lifetime posts
Thanks for the reply. I think I may not have been clear in our intent though. We currently have cedar shakes over an undercourse which is nailed to plywood sheathing. Our intention is to remove shakes and undercourse to get down to sheathing and then apply Tyvek and the Hardi-shingle. From what I gather, this sounds like an acceptable approach. Please let me know if I am not understanding you.

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