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November 12, 2012
City of Tigard
Building Department
13125 SW Hall Blvd
Tigard, OR 97223
Attn: Mark VanDomelen
Re: Brownstone at the Crossing (Ashbrook /Longstaff)
Mr. VanDomelen,
GUARDRAILS
As per the approved design documents, the design and installation of the handrails and
guardrails for the above mentioned project was done through the deferred submittal process
where railings are pre- engineered, fabricated and installed solely in accordance with the railing
manufacturer's requirements.
For this project, the railing manufacturer provided guardrails at all decks within private dwelling
units that are +36" above the adjacent decking surface. This height is not sufficient under the
2010 Oregon Structural Specialty Code which requires +42 ", but IS acceptable under Exception 1
of Section AN110.23.1 of Appendix N.
As this project could have been submitted under Appendix N, with this letter I am requesting on
behalf of our client JT Smith Companies that you approve the installation of +36" guardrails
within private dwelling units as allowed per Appendix N, Section A110.23.1, Exception 1.
FIRE - RESISTANT EXTERIOR WALLS & DOORS
With regard to the rating of exterior walls and doors between Buildings 4 and 5, again Appendix
N provides us an alternate and more favorable way of determining fire - resistive requirements
based on Fire Separation Distance. Section AN103.4 specifies fire - resistive requirements based
on Fire Separation Distance. Field measuring indicates there is 13' - 8" between exterior faces of
Building 4 and 5 when measured at doors of Utility /Sprinkler Closets. An imaginary line
positioned centered means a distance of 6' - 10" occurs to each side of this imaginary line. Per
25 CENTRAL WAY SUITE 210: KIRKLAND, WA 98033 : 425.454.7130 : WWW.MILBRANDTARCH.COM
MILBRANDT ARCHITECTS
AN1O3.4.3.1 exterior walls 5' or more from property line do no need to be fire rated. Per
AN1O3.4.3.2 openings are permitted in exterior walls greater than 5' from property line.
So, as with the guardrail issue, I am requesting on behalf of our client JT Smith Companies that
you approve non -rated exterior walls and doors at the Utility /Sprinkler closets between
Buildings 4 & 5 since they are not required to be fire -rated under Appendix N, Sections
AN1O3.4.3.1 and AN1O3.4.3.2.
Please don't hesitate to contact me with any questions or comments.
Sincerely,
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Rick B. Tolleshaug, AIA, NCARB
Principal
25 CENTRAL WAY SUITE 210 : KIRKLAND, WA 98033 : 425.454.7130: WWW.MILBRANDTARCH.COM