Soil Gas Collector Matting/ Price Per Roll, Comes in 45 foot rolls.

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Soil Gas Mat and Barriers

Soil Gas Collector Matting (for new construction)

According to the U.S. EPAs model standards for radon control systems in new house construction, a means for collecting soil gas should be installed beneath the slab. (see Publication EPA/402-k-01-002 Building Radon Out). This can be either 4 inches of washed aggregate or a mechanical collection system such as a buried perforated pipe or a permeable matting laid beneath the concrete. If aggregate is to be used, there is no need for this mat. However, in most parts of the country the importation of aggregate is expensive and can cause de-watering problems, while the concrete is curing. In this case, you can either use a fabric covered, perforated pipe that is trenched into the sub-slab area when the plumbing is installed, or you can lay a matting on top of the finished grade immediately before the slab is poured. More and more mitigators and builders are using Soil Gas Collector (SGC) matting because its installation does not entail any special coordination with the plumbers. Just lay it down around the inside of the foundation, secure it with spikes or landscaping staples, and pour the concrete.

SGC matting is superior to other mat systems because it comes with a fabric cloth completely around it. This feature eliminates the need to lay a plastic sheet on top of the matting to prevent the concrete from entering the matrix. Using plastic sheeting can cause concrete cracking due to differential de-watering. The full fabric design greatly enhances both the installation as well as the quality of the concrete slab. When SGC matting is installed below the slab, youre providing an airspace that intercepts radon before it seeps into the basement, or through the slab. SGC matting also works well as a soil gas collector beneath the plastic in sub-membrane systems for crawl spaces.

WHY AND HOW IT WORKS: The matting is a 1 inch high by 12 inch wide matrix enveloped in a polyester filter fabric. 90% of the geomatrix is airspace, which means radon has room to move to the collection point. The matting can support concrete without compressing, yet it is lightweight enough for easy handling. It comes shipped in 100 ft bundles consisting of 2 lengths of 50 feet each, for easy handling and installation.

This system allows the radon to flow through the filter fabric and into the airspace. The airspace does not clog because the filter fabric restrains the underlying gravel and soil. The natural airflow through the SGC matting then channels the radon to the pipe connection. From there, the gas can be routed outdoors. If high radon levels persist, inline fans can easily be installed to create greater air flows.

To install the matting, it is laid in a continuous loop around the interior of the foundation. The mat comes in 50 foot lengths that can be overlapped and spliced to form a continuous air flow channel around the perimeter. Corners are handled similarly. The ease of cutting and fitting the matrix eliminates the need for expensive fittings, thereby reducing the overall cost of the system.

SOIL GAS T-RISER FOR SGC MATTING

Another key element of a soil gas collection system is attaching the 4 inch riser to the matting, such that an airflow restriction does not occur at this critical juncture. This soil gas T-Riser is unique because it has special ports, which allow each end of the SGC loop to enter the collection box without special connectors.

The SGC T-Riser also has an ABS riser attached to it, which extends above the top of the concrete floor. Note that the future pipe opening is sealed to prevent wet concrete from entering the collection box. After the concrete cures, a simple cut reveals the opening into which a 4 inch PVC pipe can be connected. This unique design allows for a clean and easy connection and prevents excessive air flow resistance.

The system of the SGC matting and T-Riser very effectively streamlines the installation process during new home construction. This is very important for builders who have tight time constraints when working with subcontractors. Two people can install 200 L.F. for a 2,000 sq.ft. basement in less than an hour. The savings in time and labor is significant.

Soil Gas Collector™ - Installation Instructions

Where is SGC™ most widely applied? SGC™ is the most efficient and cost effective methods for creating sufficient permeability beneath concrete floors to allow for the capture and exhaust of naturally occurring radon gas.

SGC™ ease of installation:

Time to install is minimized, reducing labor costs.
Ease of installation reduces heavy machinery costs.
SGC™, is laid on top of the soil sub-grade prior to concrete pouring, making it the last item to be installed; no other trades can disturb or hinder installation.

Reduce material costs:

Additional Aggregate is not necessary.
Additional plastic barrier in not needed and in most cases not desired.

SGC™ Passive system:

In most cases the SGC™ will function as a passive system when the pipe stack is run through the interior of the structure and vented out the roof. Proper caulking and sealing of the slab area is also necessary.

Placing the Mat

1. Lay out the Soil Gas Collector (SGC) on the sub grade after the final preparation and before the concrete is poured. It is typically laid out in a rectangular loop in the largest area with branches or legs into the smaller areas.

2. Position the "T-Riser" in appropriate location and nail down with a 12-inch spike through hole in center.

3. Slide the SGC into openings in "T-Riser" with a portion of the fabric around the outside. Tape the fabric to the outside of the "T-Riser" with duct tape and staple the SGC to the ground with a landscaping staple near the "T-Riser"

4. Roll out the SGC, smooth it onto the ground. To avoid wrinkles and buckling, work away from the "'T-Riser", stapling it to the ground as you go. The SGC should be stapled to the ground every three to four feet, in addition to the corners, "tee's" and ends.

5. Corners are constructed by peeling back the filter fabric, cutting the two ends of the SGC matrix at 45 angles and butting (or overlap no more than 1\2 inch) the matrix together. Pull the filter fabric back and tape into place. Staple across the joint of the matrix and each leg of the corner. Use a minimum of four staples at each corner - two across the joint and one on each leg.

6. The "tees" for branches or legs are constructed by slitting the fabric of the main loop at the location desired. Cut the fabric of branch at the edges and expose 2 inches of the matrix. Cut off the exposed matrix and butt the matrix of the branch (or overlap no more than 1\2 inch) to the matrix of the main loop. Pull the filter fabric of the branch back over the main loop and tape into place. Staple across the joint of the matrix with two staples and one each on the branch and the main loop. Use a minimum of four staples at each "tee"- two across the joint and one on each on the loop and branch

7. All openings in the fabric at joints, "tee's and ends of the branches should be taped to keep out the concrete.

8. When the building is ready for the soil gas vent pipe to be installed, the top of the "T-Riser" is cut off and a four-inch pipe is inserted, caulked with polyurethane and secured with screws. The vent pipe should be labeled to avoid confusion with the plumbing pipes.

Note: The openings in the riser are laid out at 180 to accommodate straight runs of the SGC only. If the riser is to be located in a corner, which is Not uncommon, the front of the "tee" can be cut off and the SGC inserted into the new opening. The side of the "tee" which will not be used should be sealed with duct tape. This creates a "90 tee" which will allow the riser to be placed in a corner with either end of the SGC loop running into the "tee" at a 90 angle.

Pouring Concrete:

The filter fabric that comes sewn around the soil gas collector prevents the wet concrete from entering the mat and reducing its air collection capacity. The only precaution that needs to be taken is that the fabric is duct tape closed at seams of splices and corners sufficiently to keep the uncured concrete from entering.

The mat also needs to be secured to the soil with landscape staples to prevent the concrete from lifting it off the soil while it is being applied. Reinforcing bars and wire can be laid right on top of the mat.

Note that the mat is strong enough to withstand concrete workers and their wheelbarrows as they cross over it during the course of installing the slab.

Riser has special hole and spike for securing it in place.

Making Corners and Splices

The mat should be routed around the inside perimeter of the foundation. This will require an occasional corner. Furthermore, splices will have to be made to join two lengths of mat together. Corners and splices are very easy to make, and do not require any special fittings. Cut back the filter fabric to expose the core material. In the case of a splice merely overlap the core by at least one corrugation replace the cloth and tape it. Use two landscape staples to hold the splice in place. In the case of a corner slice the core of two adjoining legs of the mat at 45-degree angles, overlap the edges by one corrugation, tape the cloth and landscape staple together. The corner is illustrated below:

Cut back the cloth. Cut the core at a 45 degree angle. Overlap corrugations

Replace filter cloth. Duct tape edges to keep out concrete. Staple in place.

Connecting The Mat To The Riser

A convenient riser with a dual entry allows for either end of the loop of mat to be secured to the soil gas vent riser.

Slide the mat into either end of the riser and tape the edge to prevent wet concrete from entering.

The riser comes with a molded cap to keep out concrete Later this cap can be cut off and the 4" Sch. 40 PVC riser can be inserted, screwed and caulked into place

Risers are often placed in corners for convenience of later pipe routing. The plastic riser "tee" can be cut to allow for such situations.

Mat Specifications:

PROPERTIES	METHOD	VALUE
Soil Gas Collector Core
Core material	Plastic	Polystyrene
Compressive strength	ASTM D-l62l (Modified)	4300 PSF
Geometry	Cuspated	Waffle like
Core configuration	Standard	Double sided
Core width	Standard	3/4 inch
Core depth	Standard	5/8 inch
Soil Gas Collector Fabric
Weight	ASTM D-1910	4
Tensile strength	ASTM D-1682-64	145
Elongation at break (96)	ASTM D-1682-64	115
Mullen burst strength (PSD	ASTM D-75 1	170
Puncture strength	ASTM D-75 1	5
A.O.S.(Equivalent sieve)	COE CW-02215	70/100
Modulas at 10% elongation (Lbs)	ASTM D-1682-64	785
Trap tears (Lbs)	ASTM D-2263	75
Coefficient of permeability (Cm/sec)	ASTM D-737	0.03
Permittivity (Sec-1)	ASTM D4491-85	.8
Accelerated weathering strength (Fed)	STD #191-5804	80
Soil Gas Collector Binding Method
External binder	Standard	Sewn
Type stitching	Standard	Lock stitch
Type thread	Standard	HB92 nylon
Tensile strength	Standard	11 Lbs
Thread gage	Standard	2 lOx4denier
Chemically impervious	Standard	Ml natural

The information contained herein is believed to be accurate. However neither KT. Ventures, Inc. nor its selling agents can guarantee results of usage of this product nor assume any obligation or liability for the suitability of the material for the USC contemplated or for the information contained herein.

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