Radon Barrier Protection Strategy - Necoflex

RAM Radon Barrier Design & Installation

The Necoflex RAM System can be used in most common ground floor constructions. Some elements of the system are installed in a similar way to damp proof membranes but with much greater attention to detailing and workmanship. This system will also perform the same function as DPCs and barrier membranes (see construction detailing).

To be fully effective, a radon barrier, air and moisture sealing system must bridge cavities in walls and in doing so should form a cavity tray. Easi-Load™ Radon DPC should be used to seal walls and cavities. All designed cavities must be properly closed.
To avoid creating slip planes in masonry walls, do not place a radon resisting DPC in direct contact with a membrane (see the recommendations in IS 325-2:1995). Consideration must be given to the positioning of radon resisting DPCs and membranes in relation to thermal insulation. The recommendations contained in IS 325 - 2:1995 should be followed.

The integrity of a radon barrier, air and moisture sealing system must be maintained during installation. The risk of damage will vary depending on several factors as outlined above. For these reasons, the radon barrier membrane element of the system should be carefully chosen (see radon barrier membrane selector). RAC, Reflex Super, RMB400, RMB350 and Necoseal have different levels of resistance to damage. Where damage occurs this must be repaired by covering with a second layer of barrier membrane sealed to the original using either Necobond™ or Monobond RT™ sealant tape, depending on radon barrier membrane type. Easi-Flash™ can also be used to carry out fast and effective membrane repairs.
Installation of the Necoflex RAM™ System must be in accordance with the recommendations of IS 325-2:1995, BS 8102:1990, and the requirements of NSAI Agrement Certificate 09/0328. Additional guidance on the use of damp proof membrane materials is given in BS 8000:Part 4:1989 Workmanship on building sites – Code of practice for waterproofing.

A surface blinding of soft sand (50mm min. thickness) or geo-textile should be used to prevent puncture of the radon barrier membrane during installation. A further protection over the membrane is afforded by using high density insulation (25 kg/m3). Sheets must be clean and free from dirt and grease before application, and in view of the difficulty of achieving gas tight seals under wet or dirty site conditions it is recommended that special care is taken with this aspect of the installation.

Quick Links

Sealing walls & design cavities.

Sealing floor areas.

Sealing services & structural penetrations.

Selection of Necoflex’s radon barrier membrane.

Other design considerations. 

Construction Detailing.

    Necoflex - Ireland's most complete range of radon barrier membrane systems, scaffold sheeting,  temporary roof covers, debris netting and acoustic systems