Sandy writes from Norwalk, Ohio: "Does it matter when siding a house which product you put on first, ridged foam board or housewrap and why? I've been told both ways are the best way."

Answer: We have not tested both products together so I cannot offer accurate data. If FOAMULAR® Insulation is applied and the seams are taped, this would act as a weather resistant barrier and there would be no need for housewrap.