What is PRECON
PRECON is a composite sheet membrane comprised of a non-woven fabric, elastomeric membrane that is used for waterproofing vertically and horizontally. The plasmatic core is a seven-layer matrix designed for toughness and provides the lowest water vapor transmission (WVT) rating on the market. Once concrete is poured against PRECON and the concrete cures, a mechanical bond forms that secures the concrete to the membrane.
PRECON is used as a blindside membrane in vertical applications where access to the positive side is limited. The membrane can also be used for horizontal applications for underslab/blindside waterproofing and vaporproofing.
- Provides a waterproof seal between the membrane and poured concrete wall.
- Helps prevent moisture migration into the structure.
- Reduces methane and radon gas intrusion.
We recently created a full horizontal application guide line for PRECON; here is a snippet. To see the full article, click the link down below! Install PRECON membrane with the fabric side facing towards the concrete floor. Place subsequent rolls of PRECON with a 6″ (152.4 mm) overlap. Remove release paper and roll press into place with a tile type roller. When a horizontal application meets a vertical application, ensure this overlap is a minimum of 1′ (.3 m) from the base of the wall. Follow the end lap detailing instructions to address the overlap in this area.
Overlap membrane 6″ (152.4 mm). Prior to over- lap, apply BEM, HYDRALASTIC 836, or MEL-ROL® LIQUID MEMBRANE* (two-component) from W. R. MEADOWS in area to be lapped. Roll press membrane into BEM, HYDRALASTIC 836, or MEL-ROL LIQUID MEMBRANE. Apply BEM, HYDRALASTIC 836, or MEL-ROL LIQUID MEMBRANE 12” (304.8 mm) wide centered over the termination and while still wet, embed 12″ (31 cm) wide DETAIL FABRIC into the HYDRALASTIC 836 or MEL-ROL LIQUID MEMBRANE and roll press into place. Ensure that DETAIL FABRIC is centered over the termination with 6″ (152.4 mm) on each side of lap edge. Apply additional HYDRALASTIC 836 on all terminations of DETAIL FABRIC.