Value Engineered Roof Assemblies

A2 3 metal building walls.

Value engineered roof assemblies.

Insulation assembly pre installed r value overall u factor for roof assembly overstated perforance 1 minimum r value assembly listed in. Roofnav roofnav is a free web based tool developed by fm approvals that provides fast access to the most up to date fm approved roofing products and assemblies. Calculation based on standing seam roof ssr system table 4 wall assembly u factors thermal break cavity insulation wall u factor1 none r16 mbi 0 074 none r19 mbi 0 066 1 8 foam r25 mbi 0 057 1 8 foam r30 mbi 0 049 certifi ed r13 r30 mbi 0 042 1. 8 girts spaced 5.

At least ten north american roofing companies offer vegetated roof assemblies as standard auxiliary products and more companies are entering the field all the time. He is proud to continue engineered assemblies tradition of uniting the house of design with the field of construction by providing the best products and services to canada s architectural. Try to reduce the number of roof truss profiles to two or three and keep roof pitches reasonable for transport and assembly costs. Apa performance rated i joists pris are manufactured in accordance with pri 400 performance standard for apa ews i joists form x720 this performance standard provides an easy to use table of allowable spans for applications in residential floor construction allowing designers and builders to select and use i joists from various member manufacturers using just one set of span.

Compare rsi eff determined in step 3 with the minimum requirement for the assembly. Use bearing walls where possible to avoid large girder trusses. Insulation in this case will be below the roof deck or considered part of the ceiling assembly. 1 percent based upon comparing differences in u factors from 2013 and 2010 versions of standard of the same r value assembly.

4 check assembly for compliance with the minimum requirements. The rsi eff must be equal to or greater than the total effective rsi value required in table 2 of the 2012 esnh standard or the chosen level of insulation in the applicable builder option package. Steep slope or pitched roofs will almost never include insulation as a part of the roof assembly. Calculations based on owens corning optiliner system.

R value method u factor method c402 1 3 insulation component r value based method c402 2 and c402 4 c402 2 2 2 roof assembly table c402 1 3 c402 2 3 above grade walls table c402 1 3 c402 4 fenestration c402 4 through c402 4 4 and table c402 4 daylight controls fenestration sections above and c405 2 3 1.