how to calculate how much insulation you need?
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Measure the height and width of any windows or doors in the wall. Multiply the measurements to find the area of each window or door, and subtract them from the total square footage of the wall. This gives you the square footage of insulation you need for that wall.
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['Multiply your length, width and height figures together, giving you a total in cubic inches (in3)', 'Divide the total by 1728 (as there are 1728 cubic inches in a cubic foot).']
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* Hold the tube, take a deep breath and blow until there is no air left in your lungs. * Measure how much air is in the bottle (count the marks). To calculate your lung capacity multiply the number of marks by 250 and then divide by 1000. It's a good idea to try this 3 times and work out the average from your results.
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['Calculate the daily energy consumption: (Wattage) x (hours used per day) Divide the answer by 1,000.', 'Calculate the annual use: (Daily energy consumption) x (number of days the appliance is used per year)', 'Multiply #2 by your energy cost.']
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['Given: ... ', 'Multiply the sf area by 3 volt-amperes (VA) per sf. ... ', 'Add 1,500 VA for each 2-wire, 20-amp small appliance branch circuit and the laundry circuit. ... ', 'Add in the appliance loads at nameplate value. ... ', 'Add all appliance loads together: ... ', 'Subtract 10,000 VA from the total VA (this will be added back in later)']
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The cost to insulate an attic with blown-in insulation runs from $600 to $1,200, assuming it is 1,000 square feet in size. If you choose to hire a professional, expect to pay from $40 to $70 an hour for labor in addition to the cost of materials.
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Find the model number. Within this string of letters and numerals, you should find an even, two-digit number. The possibilities on residential units range from 18 to 60. Divide the number by 12 (which represents 12,000 Btu/hr, or one ton of cooling capacity) to get your AC unit's tonnage.
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To determine how much cellulose insulation you need, take the square footage of the space and divide it by either the depth or the desired R-value.
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Average Cost of Blown-In Fiberglass Insulation Fiberglass insulation runs from $500 to $1,060 to cover 1,000 square feet. The price per job varies based on the R-value of the insulation and the size of the project. Blown-in insulation increases your home's energy efficiency and can help save money over time.
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['Width divided by 12 = number of feet.', 'Number of feet multiplied by 3 (1 yard) = square feet/width (square feet per lineal yard)', 'Divide square feet of wall space to cover by square feet/width.']
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Average costs for ceiling insulation are usually in the range of: $8-$16 per square metre for insulation (depending on R Value and type of insulation) $8-$10 per square metre for installation (depending on difficulty and whether joists are standard spacing, if not extra work is required to cut batts to size)
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['Multiply Pole Length by Fullness Ratio.', 'Divide this figure by the Fabric Width.', 'Round the result up or down to the nearest whole number*.']
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To calculate the estimated HVAC load for a house with 2,500 square feet, 12 windows, and 3 exterior doors occupied by 4 people, simply plug it into this formula: 2,500 x 25 = 62,500 base BTU. 4 people x 400 = 1,600. 12 windows x 1,000 = 12,000.
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Multiply your square footage by 20 BTUs to get a general estimate. Typically, plan to purchase a heating or cooling unit with 20 BTUs for every square foot of space you have.
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What is the recommended thickness for loft insulation? The current regulations under the EEC programme states that a minimum 270mm of loft insulation is required.
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['wall sq. ft. = width × height.', 'block sq. ft. = (16 × 8) ÷ 144 = . 89 sq. ft.', 'blocks = wall sq. ft. ÷ block sq. ft.']
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90mm Celotex or equivalent will give the best insulation, it's insulation factor is about twice that of Rockwool. But it needs cutting which takes time and is messy. Rockwool might be easier to install, although you have to keep it in place somehow and if installed vertically ain't so simple. Its also cheaper.