10 x Felt Lap Vents Prevents Loft roof Condensation. Attic Space Ventilation

Product Information

Ridge tile vents are placed on the ridge, at the very peak of the roof to allow warm air to escape rather than condense in the roof space. The vent ridge replaces a normal ridge tile and the felt below the vent ridge is cut to allow the air out through a sleeve which comes with the ridge tile. Ridge tile vents can, by adding a pipe adapter, also be used to fix an extractor fan hose to. Despite featuring extractor fans in kitchens and particularly bathrooms which create the most moisture that disposes of some of this moisture outside, inevitably some will get through the ceiling or rise through the loft hatch if it does not have a good seal and get into the loft. I just bought a load of 200mm insulation to top up the loft to see if that would help with the problem. I cleared everything out yesterday and when I went to start rolling it out today I have noticed that the roof is covered in beads of condensation and some of the wood is damp. I'm assuming from the sub zero temperatures last night as there wasnt any rain.

Add Vent Tiles or Ridge Vents. This is more involved as you will need access to the roof from outside, and this might need scaffolding, or certainly ladders. One (or possibly more) of the roof tiles is replaced with a vent tile which, as the name suggested has a vent in it to allow air to rise out through it designed and created with a special understanding of the slating and tiling trades. There is, in fact, nothing else quite like it! On a cold day there will be condensation on the roof felt – this will be droplets running downs the underside of the roof felt It can be hard to tell if it’s condensation or the roof is leaking, particularly as it can be astounding how much moisture can condense in the right (or should we say, wrong) conditions.Essentially there are two elements to dealing with condensation; the first is to understand where comes from, and the second is how it is removed from your home. An ideal part of this type of ventilation is that little to no maintenance is required. However, if applied with sand and mortar, they need to be replaced with mortar bonds. This should be clear of insulation (or anything else for that matter) so that air can flow up into the loft space, circulate and then out the other side removing any moisture by cooling warm air down before it hits a cold surface.

Most homes will have all the features to reduce moisture getting into the loft, but we have to accept that some will get in there. Then the question becomes how to deal with it. This is where what project focuses on. Condensation will tend to be on the high parts of the roof, where as a leak might not be, or the evidence of a leak might be lower down. Condensation will be there on cold days because water condenses when the warm moist air touches a cold surface. Leaks will typically show during or after rain. Over vent” fascia is another good solution for problematic roofing spaces but does not offer as easy of an installation process. However, the mesh grill design keeps out pests and is ideal for those who desire a hidden solution, unlike soffit vents. I'm thinking I need to sort this out before I make the attic even colder with the extra insulation. Would felt lap vents like these:

Condensation and Ventilation in Loft or Attic Spaces

Typically a leak will usually have an evident external cause and be localised whereas condensation will be across the whole roof space.

There is no stopping moisture in the home. We create it from cooking, boiling the kettle, washing and even breathing out. This moisture is warm and will rise with the warm air in our houses, eventually finding its way into the loft. Selecting the amount of airflow, then dividing the roof length by the spacing (in meters) indicted below. We have a full description of the different types of roofs and their insulation in this project, however simply a “cold roof” is one where the insulation in on the loft floor keeps, or is supposed to keep, the warmth in the room below. This then means that your roofs free air flow (80,000mm2) divided by a ridge vents ventilation capacity (12,000mm2) would suggest 6.666 vent tiles, so you would need 7. Vent ridge with sleeve fitted together with pipe adapter for extractor fan How Many Vents are Needed to Ventilate my Loft?In very extreme conditions, such as experienced during the ‘Beast from the East’ in 2018, extremely low temperatures combined with fine dry powdery show can create a situation where small amounts may enter through the ventilator. It is not possible to produce a ventilator cost effectively that will allow the free flow of ventilating air and not the very fine snowflakes. Here’s a selection of roof vents with pitch preferences we have available. Discover more via our wide range of ventilation, including specific sizes: The Manthorpe Felt Lap Vent is a refurbishment product designed to increase the amount of ventilation into existing roof spaces. Roof vents are applied to the roofing of properties today to help reduce weather affecting the function of a home. You can find many types of roof vents. If your property is older, it might not be required. Older houses were never truly built with proper roof vents, but it’s worth considering if your property suffers. Wall vents that provide air to a room with heat-producing appliances (e.g., gas appliances or central heating boilers).