The most common problem we have seen with this setting is the outward leaning of the short block or concrete foundation walls that retain the backfill under the floor slab. 89 0 obj <> endobj %PDF-1.6 %���� DON’T opt for a single tall wall if you can construct multiple tiered walls. Waterproofing and Backfilling. Backfilling a foundation wall involves using either trench spoils or premium granular backfill material to fill in the trench from the bottom of the excavation to the desired grade above. %%EOF How we install the proper drainage behind an EP Henry block retaining wall. ��L Backfill the area behind the wall in layers, with gravel against the wall and fill dirt behind it, firmly tamping down each layer. This backfill should be properly compacted with a cap layer that will shed bulk water away from the foundation. R404.1.7 Backfi ll placement. Crucial for supporting the rest of the wall, a good base is made of compacted soil and at least a six inch layer of compacted sand and gravel. Backfilling & Capping a Retaining Wall - YouTube. If fill is required, consolidate and pack with a plate packer. These typically include reinforcement and rely on the combined strength of the concrete and reinforcement to resist bending at the base of the wall. h�b``�```�c`a`��� Ā B@1V �Xd��;�Yk� Cw&X�7h���)/�v/�Z�UR��^���P����������:�@���H�@1��Cv)ff-f~�����f�,ai�)�f���"�������\�P�{�8�#�4#��Sb�p.�ـ��������������Q � DZ,� However, the final choice of material should be based on the costs and availability of such materials balanced against the cost of more expensive walls. Left unrepaired, the blocks will eventually begin to shift out of line. Protecting the wall during backfilling The surest way to protect walls from damage duri n g backfilling is to backfill only after the basement floor slab and the first-floor deck are in place. Tips and tricks for backfilling and capping a retaining wall. 125 0 obj <>stream Use infill or approved on-site soils to backfill behind the wall rock in lifts of no more than 8 in. When it comes to backfilling, free-draining backfill that’s free of any construction debris will relieve hydrostatic pressure on the foundation walls, minimizing the burden on your foundation waterproofing. Whatever the material, backfilling a basement foundation puts a momentary stress on the walls. Sorry, there was a problem submitting your form. Foundation wall backfilling under or near pavement is typically done utilizing ‘premium’ backfill which can consist of sand, coarse-graded aggregate, fine graded aggregate, or a… All Rights Reserved. Manual Filling. (200 mm). See Figure UB-2. When the soil behind a retaining wall gets wet, it exerts much more pressure and weight against the wall. With backfill slope of 2 Horizontal: 1 Vertical and 10' Horizontal setback to toe of backfill, I get a maximum pressure of 625 Lb/SF (at the toe of the 10' high wall). is measured in m. 3. stating whether it exceeds or does not exceed 250mm thick. The position of the overlay is important, you don't want to neglect any loading nor to count it twice. In response to a call from the wall contractor, I visited the project site on May-16-2008 when I met the home owners, the foundation contractor, and the wall contractor, to look at the situation with the basement ICF wall for addition to the house. (152 to 305 mm) below the top of the waterproof or dampproof membrane, and should slope away from the foundation wall. Backfill; Second, a retaining wall must have properly compacted backfill. Don’t worry, once you’ve filled it out, we’ll never ask for your information again. Let’s Build a Cinder Block Retaining Wall 1. Basement wall for addition to the existing house collapses during backfill operation. Backfill refers to the dirt behind the wall. The concrete must cure for a minimum of 7 days and the foundation wall must be laterally supported, meaning the floor system is installed supporting the top of the wall. Backfilling a poured concrete wall or even a masonry concrete block wall can be very risky if two other tradespeople are not finished with their work. You generally can backfill to full height at corners and offsets. At first, filling the hole manually can seem like a bad idea, particularly if you are not … Be careful if the wall has been designed to be supported at the top, too, rather than as a free-standing structure. An alternative approach is to add up all the excavation and deduct any backfilling. Believe it or not, backilling your new home foundation requires careful attention to detail. h�bbd```b``��� ��!��� "Yt�$7�� "Y���0��j^ Ҭ,�"}�$��n[]D����� H�S�d`��l/#�����? In that case, plan on waiting seven days before placing the full depth of backfill. Stake out with pickets and excavate organic, soft soil from footing area to level. ; Use a plate compactor to consolidate the wall rock directly behind the block then compact in a path parallel to the wall, working from the back of the block to the back of the excavated area with a minimum of 2 passes. In general, use backfill that is free-draining and granular in nature. For crawl space construction, backfill or bracing shall be installed on the interior ofthewallsprior toplacing backfill ontheexterior. Exceptions to this can be made depending on the site conditions as determined by the Geotechnical Office of the Headquarters (HQ) Materials This video will help you understand the importance of proper waterproofing and the challenges associated with backfilling against an ICF wall. Note, no allowance is made for bulking of the excavated material when measuring this class of work. The concrete must cure for a minimum of 7 days and the foundation wall must be laterally supported, meaning the floor system is installed supporting the top of the wall. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube … How To Backfill And Install Drainage Behind Retaining Wall: All Access 510-701-4400 - YouTube. I imagine a common-sense answer would be that a suitably selected gravel would be a self compacting and free-draining backfill material, while retaining a high coefficient of friction (albeit with little cohesive properties).

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