Floor Void Vents

Figure 1 floor ventilation overview.

Floor void vents.

Black mold has a distinctive unpleasant musty smell. Airbricks and external cowls. The intended use of the void vent is to provide a means of ventilation when used in conjunction with an approved gas protection barrier in accordance with the recommendation s contained within nhbc guidance and bs8485 2015 a1 2019. Floor ducts are effective because they deliver heated air at floor level.

If the underfloor void is separated by dividing walls openings must be provided to allow a free flow of air around the underfloor void the standard ventilator will fit into a cavity wall with an external leaf of 100 102 5mm a minimum cavity width of 50mm and a cross cavity of 100mm. The heat then rises and continues to warm the rest of the room. If there is black mold growing in your air vents you may notice a musty aroma when you run. Floor vents are typically used in homes where the furnace is in a basement or the ducts the piping from the furnace travel through an underground crawlspace.

Blocked low level through wall air vent. If a building uses a suspended ground floor it is important to provide underfloor ventilation into the void. Ventilation in suspended timber floors can be achieved by installing vents below the joist level in opposite walls of the building and if possible on all sides of the building see figure 1. If you notice black dust around your air vents this could be a sign of black mold growing within.

From 1800 mm max. Black dust around air vents. Deep void below a solid suspended floor full of earth and rubble that needed excavation to remove the threat of excessive dampness and resultant condensation. Many traditional properties are built with a suspended wooden floor which sits above a void air space between the perimeter walls and ground if this space is not ventilated the air in it becomes stagnant and humid and the moisture within it begins to condense on the brickwork and flooring.

Vent openings 10 metres vents 750 mm max. Water droplets were found to the underside of the solid floor which did not have an impermeable vapour barrier. Alternative products may have lower rates of ventilation which could leave the sub floor under ventilated. Buy or specify rytons by name.

Find nbs plus specifications for rytons periscope underfloor ventilator rytons multifix air brick and rytons periscope vertical extension below. Apart each corner 100 x 25 mm base boards with 20 mm gaps between ventilation ventilation 50 mm gap between boundary joist and foundation wall ensure adequate clearance to ground figure 2. Examples of good timber sub floor construction that acheive the required ventilation. This prevents condensation removes stagnant air and is vital in areas where radon or methane gas may pose a problem.