Roof Ventilation Lap Vents Simple DIY Loft Vents

hello again in this video I'm going to be looking at probably the simplest and cheapest way to add roof ventilation to a loft or roof space that has breathe the membrane like this or bitumen type felt like this this is a lap vent and this particular style is one of my favorites at the moment because they're lightweight and won't damage your photo membrane as long as you're careful and if I just turn it over you can see the vents that sit directly between any overlaps and under laps in the under socking in your life these bottom vents here will be unseen on install and poke through into the gap between your roof covering and under socking finally the springy little hooks fasten the vent in place onto the under lapping socking don't worry if it's not perfectly clear it soon will be here is a planned side view of an average tiled roof although it could be slated it really makes no difference the lapped vent is inserted between the overlapping under socking and as mentioned earlier it can be membrane or the older black bitumen felt what this basically does is lean the air from inside your roof space to the air underneath your roof tiles or slates now whenever air movement occurs either by the wind blowing directly up the face of the roof or by wind entering a gutter level near the eaves it cannot help but enter the bottom of the lap vents and in turn your roof space here is the house we will be fitting these vents to today and it was built in the 1970s with no dedicated roof ventilation just as millions of older properties were there aren't any real serious problems with condensation or a buildup of heat but the only just wanted to make sure it stayed that way so a little bit of natural ventilation will help as you can see the house is quite open to the front and quite exposed to the rear so rather than fitting 20 of these vents I shall only be fitting 10 5 to each elevation ok let's get into the loft space and this is pretty much what you're going to see the first and most obvious thing to look out for is plunging through the ceiling this is because joists that you're going to walk are potentially hidden by insulation like this if you're looking ceiling joists may be visible like the ones here and you should only place your weight carefully onto these visible Timbers never between them in the vast majority of cases though the joists will be totally unseen beneath the insulation layers like this one technique is to feel the direction and position of the joists gently with one foot whilst holding on to something firm in my case the roof rafters above my head and as you can see I've found something here the other method I'm about to do now anyway is to peel the insulation back with your hands and it's at this point dust and fiberglass may be kicked up into the air and you'll be glad you're wearing a paper suit and mask as you can see I've found the joist and its direction so the other joists can be found running in the same directions faced around 400 to 600 millimeters apart now that you know where they are you can either straddle them to navigate the roof space or run plants or walking boards across them but either way extreme caution should be used what we're looking for now is an overlap and underlap in the under socking to fit our first vent - and hopefully there's one at chest height so let's fit the first one here the first thing we're going to do now is gently pry apart the overlapping layers often these can be stuck together with heat so be careful here I'm using a pointing trial but you can just as easily use a blunt knife such as a butter knife just as long as it's not sharp as you can see no real problems at all and now we know it's free we can fit the first vent now just pop the vent in with the tubs facing up and towards you I'm doing it one-handed here so that I'm not blocking the camera angle but it really is that easy take your time wiggle it in if you have to and it's very neat and unobtrusive when fitted and there you go the vent leaves a nice neat finish that won't slip has a low profile and that helps to avoid stressing the under stocking and possibly risking tears and unlike some other systems no cuts have to be made and if I just pull one out which gently daylight can be seen coming through small gaps in the overlapping tiles and it's these very small gaps that allow wind in when it blows up the face of the roof tiles and you can actually feel it on your face when this happens now I fitted another four vents to this elevation keeping them in the lower half of the roof above insulation level for maximum efficiency next I've fitted another five vents on the opposite side of the roof in slightly staggered horizontal positions this helps to ensure air circulation has to occur as no two opposing vents directly face each other and the wind can't simply blow in one and out of the other in a wind tunnel effect well that's this video complete and you can find the LAT vents I've used in this video along with an article on roof ventilation and a video of how to fix roof tile vents on the website by clicking the links here or in the description Bowl I hope this video is prove useful thanks for watching you

Channel: Fixmyroof

Views: 216,395

Rating: 4.8507938 out of 5

Keywords: Roof ventilation, roof vents, roof ventilation, roof ventilation techniques, attic vents, attic ventilation, attic ventilation techniques, lap vents, how to fit lap vents, best lap vents, fitting lap vents, installing lap vents, roof tile vents, roof slate vents, slate vents, diy vents, diy ventilation, attic ventilation uk, lap vent review, condensation in attic, condensation in the loft, lofty smell, loft vents, install lof vents, fit loft vents, loft ventilation, diy

Id: vDWzITdEt5o

Length: 6min 15sec (375 seconds)

Published: Fri Aug 21 2015