Correspondence E TEV tylAGNIO
/ &i ue
A PROFESSIONAL CORPORATION
JULY 2, 1998
CITY OF TIGARD
COMMUNITY DEVELOPMENT DEPARTMENT
1312.5 S.W. HALL_BLVD.
TIGARD, OR 97223'
ATTN: ROBERT 'POSKIN, C.B.O.
• SENIOR PLANS. EXAMINER
RE: DAKOTA MEADOWS TOWNHOMES PC #6 -94R
25 UNIT DEVELOPMENT • MST 98 0263,02,64,0265
BOB:
I HAVE. RECEIVED YOUR. PLAN CORRECTION LETTER AND. REVIEWED #1 •
THRU #7, AND HAVE A QUESTION RE ITEM #3 YOU HAVE REQUESTED
THAT WE PROVIDE R =2'1 BATT INSULAT -ION WITH, 2x6 STUDS AT 16" ON .
CENTER FOR OUR DOUBLE' PARTY WALLS. WE HAVE ' SHOWN ON OUR PLANS R -11
INSULATION WITH 2x4 STUDS 16" ON :CENTER.
IT IS MY UNDERSTANDING FROM THE DISCUSSIONS I HAVE HAD DURING
. DESIGN AND PLANNING STAGES OF THIS PROJECT WITH YOURSELF AND JIM
FUNK THAT THE R -11' INSULATION IN COMBINATION _WITH TWO -SIDED DRYWALL
AND 1 1/2" AIR. SPACE (DOUBLE -WALL ASSEMBLY) EXCEEDS R -21 VALUE.
ADDITIONALLY, .I HAVE:CONFIRMED THE USE_ OF•DOUBLE 2x4 WALLS WITH
R -11 INSULATION.AS A'PARTY_WALLASSEMBLY IN ROWHOUSE .
WITH A COLLEAGUE, AND'PLANS EXAMINER WITH THE CITY. OF PORTLAND,.ANN'
KIEM (503) 823 -7653. ANN HAS CONSIDERABLE EXPERIENCE WITH ROWHOUSE
CONSTRUCTION FOR THE CITY OF PORTLAND AND HAD A HAND IN DEVELOPING .
THE ROWHOUSE STANDARDS WHICH THE CITY OF TIGARD HAS ADOPTED.
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10570 S.W.. Citation Drive' • Beaverton, Oregon 97008 • (503) 579 -2421
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HER EXPLANATION AND MY UNDERSTANDING ALLOWING 2x4 PARTY WALLS WITH
R -11 BATT INSULATION IS PRIMARILY FOR SOUND CONTROL TO ACHIEVE THE
STC RATING OF 50. IT WAS EXPLAINED TO ME THAT THE STATE OF OREGON
VIEWS THE PARTY WALLS AS. HEATED, INTERIOR WALLS AND. NEED NO
- INSULATION HOWEVER EXTERIOR WALLS SHALL BE PROVIDED WITH R-21 - BATT
INSULATION.
IT IS OUR REQUEST THAT YOU CONSIDER THE ALTERNATE PARTY WALL
ASSEMBLY CONSISTING OF 2x4 STUDS AT 16" ON CENTER WITH R -11
INSULATION - AS MEETING'THE INTENT OF THE CODE AND IN THE SPIRIT OF
GOOD QUALITY CONSTRUCTION; .
• . R SPELT' ,LY SUBMITTED, -
PE R MAG.'•; •'ESIDENT .
• ON BE 1" LF ADF
PET :A' MAGARO ARCHITECTURE,. INC.
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