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 | | VENTING AND DRAINING TIMBER FRAME | | | Rytons Building Products | | 11/07/2008 | | | Venting and Draining Timber Frame
The Building (Scotland) Regulations 2004
Vent wall cavities with a masonry outer leaf by installing ventilators with at least 300mm² free opening area at 1.2m maximum centres. Cavities are normally drained through weep holes. These weep holes can also provide the necessary venting.
Not all manufacturers' weep holes have the capability to provide the necessary venting.
Check the air space of your weep vent – check your spacing!
NHBC Standards
The cavity should be ventilated. Ventilation openings should be equivalent to open
brick perpends every 1.5m.
An open brick perpend 10mm wide x 65mm high has a free area of 650mm².
Check the free air space of your vent – check your spacing!
By now all timber frame manufacturers of quality recognise the importance of installing venting inserts rather than leaving open perpends as they are quick and easy to fit, give uniformity and good ones offer other benefits such as internal water baffles.
But which vent should you choose from the many available?
Regulations for Scotland and from the NHBC clearly state cavities should be
ventilated; however some units marketed are dual function (weep vents) – whilst
these may seem a good idea there are some important points to remember:-
• There are some weep vents that are primarily weep hole ducts with venting
as their secondary job – are they going to give you the best performance?
• There are some weep vents that provide very little air flow (one as low as
90mm² per unit) so you will have to install more. When comparing prices
remember how many more you will be buying – and how often they will have
to be installed.
Solution? Easy! Go back to basics – regulations ask for a cavity ventilator so install a ventilator!
Rytons Slim Vent® Minor is the original perpend cavity ventilator and is used by major house builders nationwide. It has had BBA certification for nearly 20 years (your independent guarantee that it performs) and is currently the only timber frame vent on the market with the BBA's approval.
Rytons Slim Vent® Minor has a huge air space of 330mm² per unit, which
allows fitting at the maximum 1.2m centres in Scotland and approximately
every third brick to NHBC Standards, allowing a cost efficient advantage with
no compromise on quality.
Available in six standard colours (grey, black, buff/sand, terracotta, white and
clear), there's a Rytons Slim Vent® Minor to blend with most standard mortar
colours and if you have an unusual brick or mortar a colour matching service is
available – orange, pink, purple etc. they're not out of the question!
Rytons Slim Vent® Minor features unique internal water baffles, which prevent
water transfer and makes it an effective weep hole as well (see BBA
certificate 89/2321 paragraph 7.3).
Rytons Slim Vent® Minor
A vent weep not a weep vent!
Also in the Slim Vent® family:
• Rytons Flyscreened Slim Vent® Minor - For when it's felt necessary to have an insect screened cavity
ventilator.
• Rytons Slim Vent® Major - An extra long Slim Vent for blockwork or to allow for render. | |
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