Every time HP has an issue they change the rules. That should be a red flag. I can't keep up with all the updates on installation changes, that's all I'd be doing. And why should I have to. Some of the of the other cement fiber company's are facing class action lawsuits, including HP, another red flag. Smartlap face nailed and maintained properly will last a lifetime. Quiklap also is agood product you just need to maintain it. Most problems with the latter two are maintnance issues and not installation.