QUESTION

Installing Stone over Exterior Porch - I would like to install stone tile over a crawl space in a unheated porch. Will it work? Temp. range 90 to -5.

ANSWER

ANSWER - Stone that is freeze thaw stable can be used under the freezing conditions you mention. Normally that means the absorption rate of the stone should be 1% or less such as some granites, slates or quartzite’s.

It is important that the porch does not have excessive deflection and is structural sound. The porch also must be weather proof in terms of the underside not being subjected to moisture. Good Luck!