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Precast Foundation System

Bob discusses a new foundation system that doesn't require a concrete truck on site. The base is levelled with crushed stone which serves as a subfooting. The steel-reinforced wall is then lifted into place.
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Precast Foundation System

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" So you have developed a new foundation system that doesn't require concrete truck coming to the site that's right yeah and it's like to get right here isn't easy it's sandy soil. I wish there were all like got this fairly easy to tell us what you've done so far. Why we've fat level -- songs off here. And that we've -- set these blocks. With a laser transit that what I was just got done doing -- and then. These blocks are set within plus or minus set. Sixteenth emanates from the screed across them block the level off -- we've got crushed stone around the perimeter of both the house. Here 32 by sixteen bank and that you're using these little two by force to help you determine. Level essentially all the way around the height. Now how does how does this work out of this trance at work it has a laser and it. Yet that's. Laser that spend their and then and sends a signal out to the receiver there and a receiver all palace the height. -- boxes and he just moves to the reliever up and down to to get to exactly where that yeah he'll move the stake up and down to the right height. And where would -- be. That should be about right on there. Okay with just got done things we've just got done doing that I got to we've got all the way around here and -- what what what has to be done over in this act like you're just finishing up here. And -- have to. All right good then what happens if you tamp all of this stone into place you can actually just. Bring these foundation affection and the Fed him down here sure. You really don't need a footing. Why sharp we have a concrete steel reinforced concrete footing right on the wall here and we call this the question on these -- So crashed known as sub flooding and this section of your pre cast material you refer to as your footing here and boy it's hard to believe this takes the place of a big fat concrete foundation. What you got to realize that it's all steel reinforced we have steel reinforcing in this country's that is what we call a concrete that -- and it has holes in Iran electrical wiring through it. It's like you would normally do with a stick built house and it looks like insulation is already in place styrofoam insulation is already on there. -- year inflation also keeps your moisture from coming in through. To your condensation and accept all you need is a big truck and a big red crane. And to put it right into place yet."

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Choosing Between a Poured Foundation or a Crawlspace
Choosing Between a Poured Foundation or a Crawlspace

Bob's back at the Mashpee site where he meets with developer Joe Valle to discuss the foundation that is being poured. Valle explains that the excavation work for an average foundation costs about $5,000 and includes the digging, backfill, and finish grading. The poured foundation also costs about $5,000, divided equally between the cost of labor and the cost of materials. Valle estimates it will take about 30 yards of concrete to pour the average foundation, which is equal to three truckloads. Bob questions the decision to pour a full foundation and wonders if it might not be more economical to build a crawlspace. Valle explains that the advantages of a full basement far outweigh any cost savings from digging and pouring a shallower foundation. The added living space is well worth the cost, especially since the foundation must be dug and poured regardless of the depth. As for a concrete slab, Valle says that the market does not support it in the Massachusetts area. Even with a slab house, a frost wall must be dug and poured, before the concrete arrives for the slab. Once the foundation is poured for this River Hill home, posts are set every 16 inches so that the sill can be bolted to the foundation and the house can be tied down to its base.

Demolition and Reconstruction of Victorian Foundation
Demolition and Reconstruction of Victorian Foundation

Bob is with Tim Berky, the general contractor for the Rowley Victorian addition and kitchen remodel. He updates Bob on the progress since the footing for the new foundation was poured and repairs to the original foundation were made. Berky and his crew found dry rot in the existing entry and had to remove it completely. The mason had to create a sloping course to level out the existing entry foundation and repoint it to blend it into the new foundation work. Inside, Berky and his crew removed the bathroom fixtures, secured the pipes to prevent leaking, opened the walls to expose wires and pipes for shutoff, and began to cut the entry into chunks for removal. The sill was releveled and an adhesive was used to attach the new sill to the brick foundaiton.

Reviewing the Plans for the Foundation
Reviewing the Plans for the Foundation

Bob and Ryley make their first tour of the site where the foundation is already in place. Ryley notes that with a sloping grade you want to drop the foundation as you follow the grade so that you don't have a lot of concrete sticking above the ground. Bob points out that the beauty of a sloping site is that the basement provides really good living space. Looking at the smoothness of the foundation wall Ryley can tell that the contractor used new forms for the pour. The horizontal line in the wall indicates where during the pour one truck pulled out and another pulled in, not uncommon in a large pour. The honeycombing that Bob notices is purely an aesthetic issue which could have been avoided by vibrating the concrete during the pour but does not compromise the wall's structural integrity. Bob and Ryley finish up with a quick look at the plans for the basement layout.

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