_____________________________________________ Project for Carpentry Contractors of Delaminating Plywood Carpentry Contractors Search or submit a carpentry project for carpentry contractors. If you're about to buy a home twenty five years or older or you own a home around this age you may want to consider the condition of the plywood. Because between the years of 1964 to 1975 homes being built saw the installation of first-generation, fire retardant plywood. During these years, the construction of the sandwiched plys were accomplished using aldehyde-base glues [which, as it turns ou,t about 5% of the population is allergic to. Three-and-a-half million houses are constructed in this way]. Over time and given exposure to certain conditions, these glues have a tendency to break down causing the effect of delamination - separation between the layers of that ply, which characteristically takes on the appearance of wavering apart and thus greatly reducing the strength of the bond Therefore, those of you in the market for a home or about to transfer such a vintage structure may want to question your plywood's condition, especially the carpentry sections located at the roof decking from under in the attic and the crawlspace. You may want to care to either have reliable comments made by an inspector or even a structural engineer to view all reasonably accessible areas firsthand. For correcting the problem a carpenter should be called out as well that has knowledge and expertise in this area. Be sure to get the proper advice first.