Membranes
Gas Membranes
There are many reasons and conditions that cause gas to generated
naturally underground. The production of underground gases
would not normally be an issue as the escaping gases are naturally
dissipated into the atmosphere.
Problems can present themselves when building are erected
on land that is contaminated and producing gas deposits. This
escaping gas can gather inside unprotected buildings and reach
concentration levels that are dangerous to the people within.The
most common gases to cause issues like this are: -
- Methane: forms an explosive mixture in air at levels of
5-16% by volume.
- Carbon Dioxide (CO2): a toxic, asphyxiating gas; maximum
permissible levels 0.5% by volume for long term exposure
and 1.5% by volume for short tem exposure.
- Radon: a radioactive gas associated with increased levels
of cancer. Radon gas is tasteless and odourless and is highly
hazardous for human beings hence the importance of an effective
radon barrier.
Less common hazardous gases could include carbon monoxide,
hydrogen sulphide and hydrogen.
The
three most common occurences of gas contamination are:-
- Brownfield sites
- Landfill
- Natural occurrence.
To combat these issues a gas resistant membrane can be installed
in order to seal all the foundations and footprint areas of
a building. If the amounts of gas produced are particularly
high then a ventinig system is required to stop gas pressure
buildups beneath a building and vent them safely to the atmosphere.
Installing gas membranes, a gas barrier or a radon barrier
is essential from a safety point of view to remove the risk
from hazardous gases.
Containment Membranes
When
a barrier against water, oil or chemical ingress is required,
a containment membrance provides a simple cost effective method
of providing this protection. The effectiveness of any containment
installation is dictated by the quality of the membrane product
used and the ability of the implementation team to ensure
that the membrane is installed effectively.
To
this end Dance-Reeves is an approved installer of containment
products for industry leading membrane producers like PAG, Visqueen and Cordek.
More specific details of the products supplied by these manufacturers
can be seen using the links on the left of this page.
Gas Venting Systems
Dance-Reeves
Ltd stock a wide range of venting components to suit most
requirements and specifications. Items include vent geocomposite
venting tee connectors, vent boxes/gulleys with stainless
steel lids and periscopic vents.
All
of these products are utilised and installed within our specified
standard designs and backed up by our warranty and P.I.
Example of Ground Level Venting System: -
