Ventilation and Dry Fix Roofing

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 fix roofing a requirement for all pitched roofing

BS 5534 provides recommendations for the use of mortar to bed roof fittings and accessories and requires all components to be additionally mechanically fixed to the roof structure using proprietary fixings

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.

If roof ventilation always a requirement to satisfy the building regulations

Approved Document C2 of the Building Regulations requires that roofs should be designed and constructed so that their structural and thermal performance is not adversely affected by interstitial condensation

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 meant by the terms cold warm and hybrid roofs

In pitched roof construction, the insulation can either be placed horizontally above the ceiling thereby creating a ‘cold’ roof space or loft, or placed between or above the inclined rafters, thus forming a ‘warm’ roof space below the ceiling.

What's the minimum & maximum roof pitch when using dry ridge battens?

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....

Sample basket

Ventilation and Dry Fix