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Date:
To:
From:
Subject:
July 6, 2018
Chuck Miller, Senior Plans Examiner, City of Edmonds
Thaddeus Egging, KPFF
Westgate Elementary School Portable Classroom (Permit # BLD2O18-0473)
Comment Responses
The project team received Building Plan Review comments dated June 26, 2018 prepared by
Chuck Miller (attached for reference). These comments have been responded to by Briggs
Engineering. Their response letter is attached.
Attachments:
1. Westgate Foundation Comments Response Letter (by Dean Briggs)
2. Westgate Comments from City of Edmonds
3. Westgate Foundation Calculations (by Briggs Engineering)
Attachment 1: Westgate Foundation Response Ltr
DEAN BR IGGS. PE
P.O. Box 140537, Garden City, lD 83714-0537
(208 ) 87 1 -0 200 I dean@bri g gs-eng i neeri n g. com
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Dean Briggs
July 6, 2018Date:
1804.09.1-3, BLD2018-Þ(ttune 26'h Comments, Chuck Miller
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Mike
Pursuant to the Second Structural Plan Review, June 26th we have addressed the comments as
requested by your office.
Following are our responses per the 6/26 Plan Review by Chuck Miller, City of Edmonds as
transmitted to BEI via Pacific Mobile Structures, lnc.:
1) Pacific Mobile Foundation Desisn & Sheet A20.1 (FLl Coordination:
o Calculations and corresponding notation on the plans address foundation sheathing. SDPWS-
2015, T4.34, Note 2 allows g/8' ,7 /t6" and L5/32" sheathing to use the L5/32" lateral
resisting nominal values provided the shearwalls are blocked at a maximum spacing of t6"
o.c.. Attachments between the module rail and the 2x4 base plates have been clarified in the
calculations and on the foundation plan to no more than 4" o.c. in the area of the corner
shear blocks, Lateral resisting shear connections of the #12 Self-Tapping Screws at module
perimeter rail and 8d nails at P.T. 2x4 base plate are specifíed to be spaced at -inches on
center.
o Connection of module to perimeter plates in between the corner concrete shear blocks shear
blocks is not cons¡dered for shear transfer and does not need to be attached as such. A 12-
inch connector spacing is specified as a reasonable connection for general framing
requirements.
o Site welding and epoxy anchorage has been eliminated from Sheet Fl. Special lnspection
requirements for 'strong-Bolt-2' installation have been included ín Foundation Notes as item
8. Edmonds School District will be required to complete the Special lnspect¡on and Testing
Agreement for post installed anchors and have the special inspection completed per note 8,
as required by ESR-3037.
I1801.09.1-3
Attachment 1: Westgate Foundation Response Ltr
July 6,2018
2) Sheet 420.1 (F1l Detail 1:
a) Anchor strap width is shown as 3-inches in width on the plan and elevation.b) Elevation View"
o Calculations and corresponding notation on the plans address foundation sheathing. SDpWS-
201'5, T4.34, Note 2 allows 3/8" ,7 /76" and !5f32" sheathing to use the 15/32" lateral
resisting nominal values provided the shearwalls are blocked at a maximum spacing of L6"
o.c'. Attachments between the module rail and the 2x4 base plates have been clarified in the
calculations and on the foundation plan to no more than 4" o.c. in the area of the corner
shear blocks' Lateral resisting shear connections of the #12 Self-Tapping Screws at module
perimeter rail and 8d nails at P.T. 2x4 base plate a¡e specified to be spaced at 4-inches on
center.
o Connection of module to perimeter plates in between the corner concrete shear blocks shear
blocks is not considered for shear transfer and.does not need to be attached as such. A L2-
inch connector spacíng is specified as a reasonable connection for general framing
requirements.
3)Sheet 420.1 lF1 ) Detail 2 - Roof Column Supoort Pads:
Detail 2 and Foundation Plan 'A' have been modified to include a 30" sq. footing, l2-inches
thick, to distribute the mateline roof beam column support load.
a
4l Sheet 420.(F1)Detail3-Exteri Wall Pad:
a) The double 2x4 supports have been replaced with multiple 2x4 bearing plates and are required
only if the modular building is on an uneven surface. The detail indicates the spacing of the
plates is a maximum of 48-inches o.c. and the plates cannot be more than L2-inches tall. The
calculations allow the spacing to be at 6.6-ft.
b) The 2x4 plates are not directly attached to the modular rim member. The exterior sheathing is
attached to both the 2x4 base plate and the module rim. The 2x4 bearing plates are attached to
the sheathing.
c) The double 2x4 supports have been replaced with multiple 2x4 bearing plates and are required
only if the modular building is on an uneven surface. The detail indicates the spacíng of the
plates is a maximum of 48-inches o.c. and the plates cannot be more than 1.2-inches tall. The
calculations allow the spacing to be at 6.6-ft.
5) Sheet 420.L (FL) Detail 4 - Mateline pad:
o Detail 4 shows all requisite pads and blocking.o All installation requirements are noted.
6) Sheet A20.1 (F1) Plan A - Foundation plan:
a) Gridline 1.-8, Foundation Plan 'A' have been modified to include a 30" sq. footing, 1.2-inches
thick, to distribute the mateline roof beam column support load. Noted as Detail 2.b) Gridline 2-8, Foundation Plan ,A' have been modified to include a 30" sq. footing, l2-inches thick,
to distribute the mateline roof beam column support load. Noted as Detail 2.
21801.09.1-3 July 6, 2018
Attachment 1: Westgate Foundation Response Ltr
July 6, 2018
7l Foundation Calculations I I B1
a) Calculatíons have been modified to reflect tributary loads on exterior floor rim beam spans per
Blazer plans. Bearing pads have been adjusted accordingly on'AfFL' &'L/tL' to 48" o.c.
b) Supplemental calculations are included to reflect the ability of the floor beams to span 15'L0" .
This is greater than the plan spacing of the bearing pads.
8) Foundation Calculations ll.D:
o Calculations indicate the spacing required for a single 2xl2-24" P.T. wood pad. That is
compared against the equivalent effective span of the mateline beam of 16-feet as shown. ln
this instance the bearing is being provided by 'Alternative' concrete footing lieu of the
bearing pads which utilizes the base sguare footage.
o Notations for the concrete pad are included in the calculations and on 'Af F7' .
3
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1801.09.1-3 July 6,2018