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Site Work and Frostwall in Preparation for Precast Foundation

Bob teams up with, Michael Shiels, the project�s general contractor, to discuss the foundation prep work that is underway. The home site began as a piece of raw forest on the side of a hill. The contractor�s team sliced a shelf out of the hill to lay a flat foundation. Local codes required a four-foot below the frost line base for the foundation�s frost wall.
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Site Work and Frostwall in Preparation for Precast Foundation

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" Our general contractor Michael Shiels is from this area and this is an unusual. Project for you but let's talk first about the conditions here because we're in virgin raw land beautiful deciduous forest yes what you found. Well we did find a fair amount of water in the site when we started dating. We had to do some extra prep work offer. The F foundation system we're using here now when you say a fair amount of water. Do you mean there was like. Ground water that was real close to the surface -- as well we've had so much rain here because of the clay of the soil was holding all the water so there was a lot of on site water it wasn't so much ground waters. As the soil tends to hold the water it tends to hold the water okay. So you've already. Basically sliced out a shelf here for the project yes and I don't see where all the spoils went did you truck it off the site most of them yes yes OK and then what are we standing on this is three eighths crushed stone that we trucked in enough. Given a good flat level surface we can compact it really well so this just from a native quarry in this partisans crushed stone yes yeah good. Inexpensive which sat for. That's us a road fabric we used underneath the crushed stone because we had so much water when we were -- preparing a site we want to get a good base before we put the stone down. So when we compact it doesn't vibrate the water through. And then. What's happened back here I mean do we are putting in a full foundation system that is a pre fabricated foundation system what do we have already in place. Well because a local codes and the region wherein. This is a walkout basement as required that we go four foot below the frost. Before below the frost line and this is what's called a frost wall OK it's a frost wall just on the backside of the house were on a slope. And on the backside of the house you walk up to grade yes so you gotta dig an extra four feet deeper to make sure that that frost won't make it heat exactly and got it yet. You can see from the backside of these panels that they are. Made in a factory yes not for -- I guess there's a great deal of advantage to not having -- Bring concrete trucks out here into the remote countryside yes. Both timing and for cost it's very efficient to do with a -- It's all pre engineered and assembling a very quickly protect. And what the crew that is. Working behind us I guess is doing is still all the layout work -- no proper for setting on the walls OK so pinpointing all of these locations will be. Very very important because you got -- a lot of right angles to deal with now is there any kind of a foundation plan that we could look at just yet sure. All right so where we located right now -- right in this corner right here. OK so the grade goes down and so this line represents this frost wall that we were just talking about yes that's all below grade OK and then what are all these little squares -- all column pads that will support the house in the center of the marriage wall. OK they're pre cast also that's correct. That is incorporated in the stone and that when we pour the floor. It's all married as one. And is it just sits on. These will be set flush with the stone to be dug out in the center ICC you have to bury -- just a little bit and all be flush that's correct but there's no. Concrete at this level that's poured it's all pre -- precast newscast great. And then how do you get the attempting accomplished. Well once the elevations are determined. They get the perfect level -- runs now the contractor -- make sure that the compaction rate is is the way it's supposed to be. So we pass this machine across the area once or twice and that's."

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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
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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
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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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