Lap vents or Slate vents

[Ross1985]

Hi

I'm looking in to the above to create more ventilation in my loft space. We have had a PIV installed and it appears there isn't enough ventilation in the loft to reduce the humidity in the house. The supplier of the PIV wants to install Lap Vents (which are obviously a lot cheaper than Slate Vents).

The house in an end terrace around 1900s era with Stone/Slate construction.

From what I've read Lap Vents aren't advise under building regulations - this is on one of the manufacturer's websites.

The product has been designed as a remedial solution to help overcome the build-up of condensation in the roof space, however like all products that open the felt lap to provide ventilation it does not meet the code of practice BS 5534:2014+A2:2018 6.2.1.1. The specifier or user should be aware that the opening of felt laps on the roof may adversely affect the driving rain resistance of the slates, tiles or shingles, as well as increase the wind uplift forces acting on them.

Does anyone have any thoughts regarding this?

Thanks

 

[catlad]

Lap vents can easily be removed if problems arise, If you have a stone slate roof then I don't think wind uplift will be a problem as they are very heavy.

 

[qwertyuiop1]

I've used them but not sure it's made much of a difference. I've got someone coming around tomorrow and will get their opinions