Roofs form a critical component of the building enclosure because they are exposed to the greatest quantity of rain water and because their thermal resistance significantly effects the overall thermal performance of the building. 

Decks are similar to roofs in that they need to resist water penetration and heat flow. However, the construction of a durable deck is complicated by the fact that they are also open to occupant use, and commonly contain soft and hard landscaping features. Careful consideration needs to be given to future membrane replacement when designing landscaping features. 

The recent focus on "Green Roofs" provides an opportunity to provide  a very durable roof while reducing a building's environmental impact. However, their use needs to be carefully considered in the context of maintenance, repairs, replacement, and associated costs. If suitable plantings and a proper roof barrier are used, the waterproof membrane should have a long service life because it is protected from ultra violet degradation, mechanical damage, and the soil has a temperature moderating effect.  

We have a significant experience with a broad range of roof and deck assemblies and materials for both new construction and a rehabilitation projects. Our experience with roofing together with our understanding of the complexities of the heat, air, and moisture flow have led to a landmark paper concerning the performance of asphaltic urethane membranes. This paper will lead to changes in national standards for this type of roofing membrane.