U Value Of Concrete Floor Slab

Depending on the use of the building the slab can then be finished ready for use or receive a screed suitable for a floor finish.

U value of concrete floor slab. Upgrading concrete slab floors converting existing unheated basements garages and storage areas into habitable rooms is a popular way of increasing living space without constructing an extension. This simplified formula can be used for all types of ground floor including. Reference table for u values u value is the coefficient of transmission i e the transmission of heat through the materials which compose the building s envelope or outer shell. It measures the effectiveness of insulation or thermal resistance.

Such spaces typically have a sound level concrete slab floor but lack sufficient floor insulation to achieve the thermal performance targets for. 4 for doors which are half glazed the u value of the door is the average of the appropriate window u value and that of the non glazed part of the door. The type of concrete used for floor slabs typically has an r value of 0 1 to 0 2 per inch of thickness meaning a 6 inch thick slab would have an r value between 0 6 and 1 2. However u value is the measurement of heat transmission through concrete slab from ground into the closed space or vice versa.

Your final cost will depend on the slabs size thickness and if you any special reinforcement such as wire mesh or rebar. If the insulation is going below the slab the damp proof membrane dpm is laid next followed by the insulation a polythene separating layer and the concrete slab. 9u values for floors 23 9 1 slab on ground floor ground bearing floor slabs 23 9 2 suspended floors 24 9 2 1 suspended timber floor 25 9 2 2 suspended beam and block floor 25 9 2 3 concrete beam floor with polystyrene between the beams or below the beams or both 25 9 2 4 solid suspended floor precast concrete planks 25. For example a building with material with an r value of r 11 converts to an u value of 0 09 1 r or 1 11 0 09.

U value has an inverse relationship to r value. Suspended concrete beam and block ground floors upper floors 34 table a16. Upper floors of timber 34. R value is the measurement of concrete slab or other material capacity to resist heat flow i e.

A typical concrete slab costs 4 to 8 per square foot with most homeowners spending between 5 35 to 6 17 per square foot or 113 to 126 per cubic yard for both materials and installation. A reasonable r value for a normal concrete slab can be estimated using an r value the thermal resistance per inch of thickness between 0 1 and 0 2 and multiplying it times the slab thickness. What is r value and u value of concrete slab. A simplified method of calculating the u value of an uninsulated floor has been described in bre information paper ip 3 90.

For a 6 inch slab r value would be between 0 6 and 1 2.