Sub Floor Ventilation Calculation

Federal housing authority recommends a minimum of at least 1 square foot of attic ventilation evenly split between intake and exhaust for every 300 square feet of attic floor space. This minimises sub floor moisture which helps to prevent timber decay and creates an environment that discourages termite attack. How many vents are needed.

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Squared nett ventilation per lineal metre on both external and internal walls.

Sub floor ventilation calculation.

The sub floor space must be free from all building debris and vegetation. 3600 specifies that the minimum requirement for sub floor ventilation should be one 1 ventilator of 8 400 mm. This inadequate ventilation can cause some serious problems. Sub floor ventilation clause 2 3 8 3.

Of the australian standards a s. 2 requires the sub floor between a suspended floor and the ground to be ventilated. Let s say you re inspecting a building in climate zone 2 and the subfloor walls have wire mesh air vents. Proper attic ventilation consists of a balance between air intake at your eaves soffits or fascias and air exhaust at or near your roof ridge.

A minimum of five air changes per hour should be provided and double that for wet subfloor spaces. Save time by using this handy calculator to work out how many rytons periscope vents with rytons multifix air bricks are required for suspended timber or block and beam floors. A clear opening area of 3500 mm 2 100 x 35 mm should be provided for every square metre of floor area. Typically subfloor systems are energy efficient to calculate the annual cost of operating one look at the motor wattage.

Rytons underfloor ventilation calculator for effective sub floor ventilation. My concerns began with our pre purchase survey it was a bit of a cut and paste job to be honest and stated the obligatory inadequate sub floor ventilation possible sub floor rot better get an expert in to check blah blah 146. Subfloor ventilation the 2005 branz house condition survey found 38 of homes with suspended timber floors had less than half the subfloor ventilation required by the current building standards. See if you can calculate the number of vents needed in a wall.

The wall is 12 metres long and the opening size of each vent is 14 200 mm 2. Subfloor space is undertaken annually as part of normal house maintenance. Timber queensland limited technical data sheet 14 sub floor ventilation revised february 2004 page 3 ventilation efficiency. Unfortunately sub floor ventilation is often a forgotten part of termite management.

Openings should be provided within 750 mm of. The space under a suspended timber framed floor must be ventilated. Obstacles that prevent air flow to and from vents will reduce the efficiency of the sub floor ventilation system. As a rough estimate a 100w motor will cost approximately 51 to run annually for 4 hours per day.