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Trinity Engineering, Inc.) in Seattle, WA, in 1986 and has since expanded the firm to include offices in Waterbury, CT, and Portland, OR. Colin is a Registered Roof Consultant and has been elected to the RCI Jury of Fellows. He also is a LEED® Accredited Professional, a certified EIFS Third Party Inspector, and an ICC-certified Building Inspector. Colin is the principal author of The Roof Construction Guide for General Contractors, published in 1998 by RCI.
training and certification program developed by AAMA.
In the past, it was not uncommon for a project architect or specifier to pass a major portion of the design responsibility over to
“NO LONGER SHOULD IT BE ARGUED THAT THESE CRITICAL TASKS CAN SIMPLY BE PASSED ON TO THE CONTRACTOR AND HIS/HER SUBCONTRACTORS.”
the building contractor by simply calling out “flashing” on a typical wall section or roof plan within the project documents. We have seen construction drawings in which the designer’s entire guidance for proper flashing and weatherproofing of the exterior wall and roof covering systems consisted solely of the brief specification, “Comply with applicable code requirements” inserted into the General Notes. In these cases, the project’s design professional quite simply is stating that while it is his/her general “design intent” that the building envelope shall not leak, it is up to the contractor to figure out how to carry out this broad mandate.
However, the referenced new I-Codes2 now make it completely clear that the final responsibility for a detailed and effective design for the building envelope remains with the project’s designated design professional
and/or the qualified roofing and waterproofing design professionals assisting the project. Prior to issuance of the building permit, the construction documents must include comprehensive waterproofing details:
“… including flashing, intersections with dissimilar materials, corners, end details, control joints, intersections
at roof, eaves, or parapets, means of drainage, water-resistive membrane, and details around openings.”
Further: “The exterior wall envelope shall be designed [bold emphasis added] and constructed in such a manner as to prevent the accumulation of water within the wall assembly by providing a water-resistive barrier behind the exterior veneer…”
“Roof coverings shall be designed [bold emphasis added], installed, and maintained in accordance with this code and the approved manufacturer’s instructions such that the roof covering shall serve to protect the building or structure.”
Note in the code language quoted above the addition (new to the I-Codes) of the short phrase “be designed,” which advises the project’s design professional that his/her standard of care typically will include project-specific detailing (typically during the pre-construction process) of the wall and roof covering systems and their associated flashings. No longer should it be argued that these critical tasks can simply be passed on to the contractor and his/her subcontractors.
Volumes have been written about moisture and its movement. This discussion will inform the reader of the various ways that moisture can move in and take up residence in a building cavity (assembly),such as the space between the exterior and interior walls.
Moisture movement occurs when it moves from one state or one point to another.
Sounds simple enough, doesn’t it? How does this happen? Well, let’s review a few simple rules regarding moisture movement:
• Moisture flows downhill.
• Moisture looks for an opening.
• Moisture follows the path of least resistance.
• Warm air holds more moisture than cool air does.
• Moisture moves from a higher humidity to a lower humidity.
• Moisture moves from warmer temperature
to a cooler temperature.
• Moisture moves from higher vapor pressure to a lower vapor pressure.
Put another way, just think high to low, like the evening weatherman showing a high pressure moving to a low pressure.
Beginning with water in its solid state (ice), if enough heat is added, it changes to water. If more heat is added, the liquid changes to a gaseous state. Removing heat causes the reverse to occur. Therefore, it can be said that heat or the absence of heat is the mechanism that allows water to change states.
These critical joints must be designed to resist more than just the force of gravity
READ THE REST BY CLICKING HERE http://www.deckmagazine.com/framing/stronger-post-to-beam-connections.aspx?dfpzone=home
Consider span, spacing, and depth to build beyond code for a small upcharge