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r <br />Paul Hanson <br />September 24, 1998 <br />Page 2 of 3 <br />2. The following observations were made with respect to the foundation of the boathouse: <br />3. <br />4. <br />a. <br />b. <br />c. <br />d. <br />e. <br />f <br />The foundation is an 8" thick concrete masonrv foundation system. <br />The boathouse is built in the side of the hill with grade at the roof line at the rear <br />and grade at the slab height at the front with grade sloping along the side walls. <br />The stmeture is ten courses high (7'-4"). The slab on grade provides space <br />approximately 10 feet deep with a transverse wood frame wall at this location <br />with backfill appro\in»ately 3'-8" above the slab sloping up to lire rear foundation <br />approximately 6 feet away. <br />No exploratory work was done to determine the depth of the footings. <br />Horizontal cracks exist in the masonry side walls indicating frost heave with the <br />wall out of level approximately 1/2" over its length. <br />The rear foundation wall is severely damaged due to e.xcessive earth pressure and <br />frost heave. <br />The following corrective measures are required in order to provide a structurally sound <br />foundation conforming with the Minnesota State Building Code: <br />a. Reconstaict the rear wall with 12" block on 16" x 8" footing a minimum of 5 feet <br />below grade. Reinforce with #4 @ 32" vertical in center of wall with hook dow'cl <br />into footing. <br />b. Remove wood frame wall and construct new masonry wall 8" thick on 16" x 8" <br />footing wth lop of fooling 4" below bottom of floor slab. Reinforce with H @ 32" <br />vertical in center of wall with hook dowel into footing. Tie this wall to existing <br />pilasters in side wall W'ith #4 dowels @ 16" O.C. grouted in place. <br />c. Underpin front foundation wall and side walls to provide a ininintum of 5 feet to <br />bottom of footing on exterior grade. Underpinning to be done in accordance with <br />standard practice 4 feet wide strips. <br />d. Tuckpoint and repair cracked block and other masoiuy to pro\ ide a solid w'all. <br />c. Tooth rear wall to side walls to provide a rigid wall system. <br />f. Construct wood roof system using standard carjienlry procedures with roof plate <br />anchored to ma.sonry wall in accordance with the Code. <br />g. Provide wood blocking @ 24" O.C. in first two joist spaces with nailing to rear wall <br />top plate in accordance with the Code. <br />Since the boathouse is a utility structure, protection against frost on the interior is not <br />recommended or required in my opinion.