1024 35TH ST 2016-01-01 MF Import

Mascio Residence —1024 35'" Street Everett, WA July 7, 2006 We have estimated the weight that the building exerts on the perimeter foundation subgrade soils. The maximum calculated structure weight is approximately 1,111 pounds per lineal foot (pl� of perimeter wall. The assumed structure load includes dead loads such as the weight of the framing, flooring, roofing and foundation self-weight. The live loads that we included in our structural weight estimate were the code-prescribed, resident;.,l floor loads and snow loads. We increased the value of the calculated structure weights by 50 percent to determine the maximum spacing between piers. As a result, we recommend that the maximum spacing between piers be no greater than 6'-0". The following tab�e summarizes the results of our calculations of maximum allowable downward pier capacity �ased on pier to pier spacing. Based on our evaluation of the site, the way the house was built, and our experience on similar projects in the Puget Sound area, we anticipate that soils capable of developing the required axial pile capacity may be encountered at depths between 15 and 25 feet below the existing bottom of foundation wall. An ORA representative should be present to verify that the Grip-Tite piers are installed in accordance with our recommendations. Cracking of slabs, foundation elements, interior sheetrock, or plaster is not uncommon when re- leveling or stabilizing a structure. Concrete slabs that are bonded to foundation elements being lifted may also be lifted forming voids beneath the slab. The presence of voids beneath slabs can result ir; cracking. Concrete slabs may be s; w-cut close to the foundation element being lifted prior to pier installation to reduce the risk the new cracks forming in undesired locations. We recommend that all crack repairs be performed after the pier installation and re-leveling process is compieted. We recommend that roof downspouts not be allowed to discharge onto the ground surface adjacent to the residence to reduce the risk of further consolidation of loose soils beneath foundation elements, which are not be supported by Grip-Tite piers. We recommend that gutters be instalied along the lower edge of all roof areas and that all of the roof drains be tight lined to an approved discharge point away from the house. We also recommend that ground surface at areas adjacent to the residence be sloped downwards to promote positive drainage of runoff water away from the residence. Otto Rosenau & Associates Inc. Page 3 of 4