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What size wall vents do i need for my shed?

Anonymous user 23/02/2024 - 3.47 PM

I have a shed that measures 363cm x 243cm (143 Inches x 96 Inches). I have put 2 x vents in the walls, One at either end, one high up and one low down. The circle hole i cut in the wall for each vent was 150mm (about 6 inches). I need good ventilation as fishing equipment is kept in the shed so its a lot of damp items, last year i had really really bad black mould issues in the shed due to this, so i have now put these vents in the walls to try stop the problem. Are they enough? Edit 09/06/22: The shed is on patio tiles (sandstone) so not soaking up water from a mud / grass floor, the shed floor is dry, it is also raised off the patio floor on wooden boards, about 75mm i would say. There is no tree near the shed, there is a fence only which covers the northern side of the shed. I'm just looking for some kind of calculation to what size holes i need to make sure there is enough ventilation so this winter i don't get black mold again. I currently have 2 x 150mm holes cut out and vents with mesh put in them.

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2 Answers

Anonymous user

You have to check that condensation is not coming from the floor. You need to check condition from the outside too, if you don't have a tree, something that might be shading too much. And also the condition of your roof.You can do a test on your floor take a square of plastic and put tape around it on the floor and leave it for a day and see how wet it is getting.

Answered9 June 2022

I & M Property Services

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Rainham

Hi, As above, moisture can be getting in from almost any source. For mould to grow typically the moisture content has to be over 55%. If for example your wet fishing gear was resting next to the wooden shed wall this would be a prime example. Trickle vents placed at the top of the shed, one at each end are one of the cheapest options. this allows both cross flow and full circulation of air as the warm air from the ground rises, carrying the moisture with it. As for the calculation that gets completed. It depends on a huge variety of factors such as room size, use of room etc. Typically a shed has plenty of ventilation by default. However a 'simple' calculation would be to work out the volume of the room in mm2, then you can check what type of vent would be required to allow that amount of air to 'pass' through the vent in an hour. The figure will change depending on the room type etc. There are plenty of room ventilation calculator's if you do a google search. Using that answer any decent vent will show you what the air transfer rate is per hour. Hope that helps.

Answered12 June 2022