Product category:
Drainage Services
News Release from: Hepworth Building Products | Subject: Ventilation Terminal Insert
Edited by the Buildingtalk Editorial
Team on 28 June 2004
Chimney Breast Dampness - A Simple
Solution
Rainwater ingress can readily be prevented whilst still providing the necessary air flow to combat condensation. The answer lies in the use of a product called a 'Ventilation Terminal Insert'.
Owners of older properties around the country may be scratching their heads to understand the cause of mystery damp in and around chimney breast locations Damaged external brickwork, cracked roof tiles or missing sarking felt could all be potential contributors
This article was originally published on Buildingtalk on 5 Sep 2007 at 8.00am (UK)
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However, often there is a much less complicated answer.
Where chimneys are no longer in use rainwater can cause problems.
To address this, it is not uncommon for chimneys to be blocked off at the top.
Warm air rising from within the property may then condense on the inside of the chimney, resulting in damp appearing on the breast and surrounding ceiling area.
Says Bryan Knott, Product Manager responsible for Terracotta products at Hepworth Drainage: "Whether or not a chimney is in use it still needs to be ventilated.
Rainwater ingress can readily be prevented whilst still providing the necessary air flow to combat condensation." The answer lies in the use of a product called a 'Ventilation Terminal Insert'.
These Terracotta Products have a closed top, with ventilation holes set vertically around the circumference so that air flow is maintained, both up the chimney and around the top of the stack, whilst keeping rainwater out.
Ventilation Terminals come in a number of attractive designs and colours (red, buff and blue-black).
Selection and installation are both simple.
Terminals are available for a range of different diameter chimney pots so it is purely a matter of choosing a terminal with a slightly smaller diameter than that of the pot.
The terminal is designed to sit inside the pot without the need for other fixings or mortar.
It is, of course, important for safety reasons, only to use these terminals to ventilate redundant flues.
If a decision is later taken to install a multi-fuel (Solid Fuel) fire or gas heating appliance the Ventilation Terminal should be removed prior to operation, otherwise there is a risk that gasses from the fire/heater will not be vented correctly to the outside atmosphere.
To assist installers in making the right choice Hepworth Ventilation Terminals are impression stamped with the words 'Not to be used as gas terminals' 'For the ventilation of redundant flues only'.
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