Adding ventilation to loft

[phatboy]

I need to add ventilation to our loft, amazingly it doesn't have any, and recently I have found dampness on boards up there.

There are no compatible tile vents for the 1950's style of tile we have unfortunately.

My loft insulation goes right into the corners and into the soffits, to meet the EWI.

My plan is to fit 2 vents on each elevation into the soffit, and use flat ducting to bring the air passed the insulation and into the loft.

But is this the best approach? It's going to be a bit of a pain, so I am open to any suggestions that would make it easier.

Thanks!

 

[^woody^]

Timber wedges between all the felt laps

 

[phatboy]

Timber wedges between all the felt laps

Really? Sounds far too simple!

Why do people bother with fitting those round vents into the soffit boards?

 

[^woody^]

So that they don't need timber wedges between the felt laps.

 

[phatboy]

So that they don't need timber wedges between the felt laps.

Is one preferential to the other?

And would these be as good as timber wedges? https://www.roofingsuperstore.co.uk/product/felt-lap-ventbox-of-50.html and avoid me needing to cut many many wedges?

Thanks Woody!

 

[^woody^]

Yeah, looks like they read DIYnot and copied my idea from years back.

Thats the principle anyway. You can use anything that gives the same effect - polystyrene or foam cuts, and easiest will be some of that foam copper pipe insualtion cut into sections

 

[garyo]

Yeah, looks like they read DIYnot and copied my idea from years back.

I still don't understand why they're so expensive given that it's just some plastic. You want to get on dragons den woody... This time next year you'll be a miwionaire.

 

[23vc]

I’ve gotta do the same on mine, I’ll use woodys version though (stuff any random objects I can find up there)

 

[Adam182]

I've recently vented mine using the Grey pipe insulation, its extremely cheap to buy i just cut it to rounghly foot long strips and pushed it between the felt laps, it's worked a treat and fits alot tighter than when I tried with batons.

 

[23vc]

So even if you’ve got interlocking tiles with lots of moss ( not much airflow?) venting the laps is expected to work?

 

[Adam182]

So even if you’ve got interlocking tiles with lots of moss ( not much airflow?) venting the laps is expected to work?

Moss on tiles is never a good thing so I would see about removing that, I just made sure I could see daylight when pushing the pipe lagging through the laps whilst being mindful of not going too far as to the point that it might compromise the water tightness, on a breezy day its very effective.

Ideally re roofing with breathable felt would be the one but it will have to wait for now.

Heres a couple of wip photos I took before installing celotex inbetween the rafters...