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���'�`,�Q� Bassett Creek Business Center <br /> ��������� 901 North 3rd Street. �100 <br /> ����� Minn��polis. MN 554Q1 <br /> structural � 612-827-7825 voice <br /> : <br /> engineers � 6I2-827-a805 fax <br /> September 26, 2014 <br /> Mr. Ross Langhans <br /> Structures Unlimited, Inc. <br /> 5425 Clayton Drive <br /> Maple Plain, MN 55359 <br /> Re: 1180 Loma Linda Boathouse Review, Orono, MN <br /> MMY Job#: 14553.00 <br /> Dear Ross: <br /> At your request, we have completed our structural review of the structurally damaged framing at the <br /> boathouse of 1180 Loma Linda in Orono, MN. Our scope of work included one site visit conducted on <br /> Thursday, September 18, 2014 to observe the visible structural components of the boat house, discuss <br /> the observable deficiencies, and offer comments on typical repair procedures. You were present during <br /> our site review to assist with access to the property and discuss the conditions. <br /> 13es9c�iption of Structure <br /> The boathouse structure is comprised of a cast in place concrete roof slab, concrete masonry walls, and <br /> a concrete slab on grade. All elements observed were in an advanced stage of structural distress. <br /> Observations and Recommendations <br /> The structure is damaged to a point that requires all of the primary structural elements to be replaced or <br /> reinforced. <br /> We discussed repairing the structure (not recommended) or replacing the structure with similar new <br /> materials (recommended) as follows. <br /> Basic repair procedure for the boathouse structure (not recommended, b structurally acceptable): <br /> 1) Shore the s cture as necessary to prevent collapse durin excavation. <br /> 2) Excavate down the foundation on exterior and interior II sides. <br /> 3) Cut the roof slab e as necessary to place it square er the m�sonry walls. <br /> 4) Replumb the walls a replace all broken blocks, t kpoint the apen mortar joints. <br /> n 5) Reattach the roof slab t the masonry walls by ling#4 x 2' long rebar dowels down <br /> �C�� through the roof slab and acing them into t block wall at 16" on center. <br /> /��� �`� 6) Sawcut new#4 @ 16" on ce er vertical r � forcing rebar into the existing masonry, and grout <br /> `�U(� � the walls solid. <br /> `�� 7) Jack the roofslab back to flat. Dril adhesive anchor#4 U bars, 4" long each leg, with 2" <br /> r Q; embedment into existing slab at 1 center down the middle of the boathouse. <br /> J8) Prepare the top of the roofslab nd ca an Epocem 110 bonded 8" minimum thickness, <br /> 4,000 psi air entrained concr e slab reinfo ed with #4@ 12" on center each way placed 3/4' <br /> clear from the bottom and ' clear from the e s over the shored existing roof slab. Slope <br /> the top to drain with mi � um of 1/8" per foot cro ed pitch. <br /> 9) Place membrane wa rproofing on exterior of block e ended up to top of concrete slab, <br /> place daylighted d intile at three buried sides, seal top and sides of new concrete slab with <br /> penetrating silo ne sealer. <br /> 10) Replace slab grade with 3" thick 4,000 psi air entrained slab on grade with welded wire <br /> fabric reinfo ing. <br /> 11) Replace ors and handrails. <br /> 12) Landsc e and complete work, making good as necessary. <br /> Page 1 <br /> �(�l ,S - CTD �� � <br />