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LJO ENGINEERING, LLG
PO BOX 888, E55EX, MA 01929
PHONE: T75-890-1100, FAX: 9'18-231-0098
MEMORANDUM
Date: July 19, 2016 � �,jµOF A146
To: Nick Nikolopoulos, Building Superintendent o2 LISAJ. yc
S&H Realty Trust O'DONNELL
CO) STRUCTURAL y
No.39117
From: Lisa J. O'Donnell, PE q9p 9- /STEPEO��T
FSS/ONAL�G
Subject: 116 North Street, Salem, MA
Repair of Building Parapet Lpevy 0 bmn&a
Re: Site Inspection and Review of Plans for Repair Work
This memo is intended to follow up my earlier memo of May 7, 2016, regarding the
parapet reconstruction and to review your current reconstruction plans and outline my
recommendations for the work. I visited the site yesterday to observe the current
condition of the building facade, where the masonry parapet has been removed and the
construction staging remains in place. My comments below are based on my
observations yesterday.
First, I understand that instead of reconstructing the masonry parapet, as I believe the
original plan was, you are now intending to rebuild the parapet using wood framing and
to clad it appropriately to make it weathertight, including tying it back into the existing
roofing. This approach is certainly fine from a structural point of view, as the masonry
parapet only added load on the fagade, which led to the earlier deteriorated conditions.
I address the details of the proposed parapet further below and include a sketch at the
end of this memo.
Second, the current condition is that the masonry parapet has been removed, but all
other existing components remain, including the roofing and flashing that was over the
parapet and the roof framing and the steel lintels that supported the masonry over the
storefront openings. My recommendations are that the existing roofing and flashing that
was over the old parapet be folded back onto the existing roof and held there
temporarily (weighted down with boards or similar)while the parapet is reconstructed.
Folding this roofing back so that it is not hanging over the storefronts will allow you to
remove the staging that is currently in place across the full front of the building.
Next, with that larger staging gone, I understand that you intend to complete the wood
framing and sheathing from a smaller set of staging (both narrower and shorter), which
is certainly acceptable, as long as good safety practices are in place and pedestrian and
traffic protection is ensured.
Parapet Repairs at 116 North Street, Salem, MA
Provided to S&H Realty Trust, Salem, MA
July 19, 2016
Page 2 of 3
The current structure of the building roof includes roof rafters that frame side to side of
the building, resting on bearing walls between the various stores along the strip. This
framing is not affected by either the removal or replacement of the parapet and will
continue to remain in place with no modifications necessary or recommended. It will
just be important to, at the end of the parapet reconstruction, restore the roofing behind
the parapet to ensure watertightness along that edge.
In addition, as I mentioned above, there is an existing steel lintel that frames also from
wall to wall over the storefronts. This includes a pair of steel channels for strength and
a lintel angle attached to them which used to support the masonry parapet. The
proposed new wood framed parapet will be much lighter than the masonry one it will
replace, so this steel structure is certainly oversized and, actually, unnecessary for the
wood framing that you will put in place. However, it makes no sense to try to remove
the steel lintel as it is neither in the way or causing any other issues. Therefore, my
recommendation is to leave this in place and work the wood framing for the new parapet
around it.
As my earlier memo discussed, it is important to tie any parapet construction back to the
roof diaphragm structure, to ensure its stability over the storefront openings. As you
and I discussed at the site yesterday, you will tie the new wood framing back to the
existing roof structure in the following manner. You will put short lengths of horizontal
2x6 wood members, on the flat, under the first two roof joists. Prior to putting these in
place, you will secure a Simpson A34 framing angle (see below) to the far end of the
2x6, which will be screwed to the second joist in with the A34 framing angle. Then you
will attach another of these angles, also tying the flat 2x6 to the first joist. The A34
angles will sit flat on the top of the 2x6s, with the vertical legs screwed to the front sides
of the first two roof rafters. These flat 2x6s will extend out to be flush with the front face
of the wood framed parapet wall and the studs of this wall will be screwed to the flat
2x6s through their sides. I recommend that these flat 2x6s be spaced at 32" centers, so
that every other stud of the parapet wall, assuming these to be 16" OC, is tied to these
horizontal members which engage the roof diaphragm through the roof joists.
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LJO ENGINEERING, LLG
PO BOX 888, ESSEX, MA 0101201 - PHONE q,78-5q0-'1100 - FAX q'18-231-00ge,
Parapet Repairs at 116 North Street, Salem, MA
Provided to SRH Realty Trust, Salem, MA
July 19, 2016
Page 3 of 3
The sketch below shows this proposed detail schematically:
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I believe that this memo has addressed both the current conditions and the
requirements to move forward with the work, as well as my recommendations for the
final wood framed parapet construction. However, if you or any others associated with
the work have further questions, please contact me at once so that these may be
resolved and the work continued.
LJO ENGINEERING, LLC
PO BOX 888, E55EX, MA 01929 - PHONE 978-890-7100 - FAX 978-231-0098
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L.JO ENGINEERING, LLC
PO BOX 555, E55EX, MA 01929
PHONE: 918-890-7100, PAX: 978-231-0098
MEMORANDUM
Date: May 7, 2016
OF MgSSgc
To: Nick Nikolopoulos, Building Superintendent o2 LISAJ. sc
S&H Realty Trust o O'DONNELL
0 STRUCTURAL W
No.39117
From: Lisa J. O'Donnell, PE X90 9Fc,s7EP�°a�`Q
FENS'
Subject: 116 North Street, Salem, MA SS/ONAL
Repair of Building Parapet afWJ O'17onr #a
Re: Review and Recommendations for Repair Work
This memo is intended to review the scope of work for the repair of the brick and
concrete parapet on the one-story building at the above referenced address. You and I
visited the site on March 31, 2016 to review the existing condition and the proposed
methods of repair. Below I review steps of the work and recommendations for the
reconstructed parapet.
The work plan you outlined to me included the erection of staging along the building
front to allow masons direct access to the work area and to provide protection for the
area below the staging, so that the tenant businesses are not impacted while the work
progresses.
This staging should be tight to the fagade so that material cannot fall between it and the
building, to the areas below. In addition, the outside perimeter should have protective
barrier as well, such as demo fabric fencing or similar material, again, to protect against
small, falling debris. Clearly any signage on the front of the building will need to be
temporarily removed to accommodate the work. The work may be done in stages along
the storefronts, as long as the existing parapet is temporarily braced to the staging
where the limits of the work area end.
When the staging is in place and secured, the masons are to dismantle the existing
parapet, including the brick and concrete blocks, down to the level of the tops of the
storefront openings, along with a few blocks between these openings, where they have
been pulled out of plumb (as at the paint store sign). The roofing behind the parapet is
to be carefully detached from the back as the dismantling progresses and allows, and
rolled back and secured for replacement at the end of the work.
Once the existing bricks and blocks have been removed to a point where the existing
components remain well attached and plumb, the replacement and reconstruction work
Masonry Parapet Repairs at 116 North Street, Salem, MA
Provided to S&H Realty Trust, Salem, MA
May 7,2016
Page 2 of 2
can begin. As the parapet is rebuilt, by reassembling the blocks and bricks removed,
my recommendation is that brick ties, of sufficient length, are used to tie the masonry
parapet back to the face of the building and to the roof sheathing. The sheathing will
have been exposed when the rubber roofing is rolled back, so it should be
straightforward for ties to be secured to this surface. These will help restrain the
masonry back to the roof structure, for additional support. Special attention should be
paid to those areas where the tenant businesses will rehang signs, so that extra ties are
included in these areas, to help offset the loads from the attached signs.
Additionally, I recommend that, once the masonry parapet has been completely
dismantled, the existing building and any structure behind this area be inspected to
ensure that it is in good condition and serviceable. I believe that you can complete this
inspection, however, I am available to review it also, should you have any questions or
concerns.
Once the parapet has been rebuilt, the rubber roofing should be reattached to the back,
to restore the roof. In addition, I recommend that a sealer be used on the masonry, to
help ensure its serviceability, considering that the concrete blocks to be reused are
made of older concrete.
When the above steps and my few recommendations are followed, the reconstructed
parapet should be safe and stable for many years to come. Should you or anyone else
involved with the work have additional questions or concerns, please contact me at
once, so that the work can proceed and this essential repair completed.
LJO ENGINEERING, LLC,
PO BOX 555, E55EX, MA 01929 - PHONE 9'18-890-7100 - FAX 975-231-0098