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Ventilation and Dry Fix

Ventilation and Dry Fix

Can RidgeFast be used with clay decorative ridges?

RidgeFast can be used with some decorative ridges, but not all....

How do I ventilate a cold roof

BS 5250 specifies sufficient ventilation as being: 25mm along the length of the eaves for pitches of 15° or less 10mm along the length of the eaves for pitches of more than 15°.

How do I ventilate a warm roof

BS 5250 specifies sufficient ventilation as being: 25mm at eaves on each slope and 5mm at ridge.

How do you calculate the number of ridge unions required?

The number of ridge unions required is not the same as the number of ridges....

How much ventilation is required on a cold roof as opposed to a warm roof?

Different amounts of ventilation are needed for cold and warm roofs...

How to avoid condensation call backs

The best way to avoid this is correct ventilation from the outset – which means complying with BS 5250:2011+A1:2016 ‘Code of practice for control of condensation in buildings’ and BS 9250:2007 ‘Code of practice for design of the air tightness of ceilings in pitched roofs’.

Is dry verge easy to install

Although dry verge is easiest to install on a new roof by your roofing contractor, it can also be fitted retrospectively by anyone.

What is breathable underlay and can I use it

Breathable felts come in two types: Vapour Permeable and Air open underlays.

What is dry fix

Dry fix systems provide a mechanically secured alternative to mortar.

What is the minimum and maximum roof pitch where the dry ridge batten sections can be used?

This will depend on the tile being used....

When are batten end clips required?

Batten end clips are used to comply with BS 8612.

Where do the eaves vent strips go when using underlay?

This depends on the type of underlay being used....

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