MegaSack DRAW - This year's winner is user - rgwb
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I want to get my house rendered, it has never been rendered before. Apparently, because I am rendering more than 25% of the external surface, I must find the U Value of my house to work out if I need to get building compliance involved.
My house is brick, I have no idea what brick or what the thermal properties of the brick are. I have cavity wall insulation, again I have no idea when it was fitted, what was used and what the thermal properties are.
Will an SAP assessment provide me with a U Value and watts per square metre per degree Kelvin (W/m²K)
Will an SAP assessment provide me with a U Value and watts per square metre per degree Kelvin (W/m²K)
It will give you an estimate based on what details you give them.
Linked below is an online calculator that can give you a rough idea of what you have,
I did this at Uni. I still have some books on this subject. I could dig them out if you like.
^See above my post. Already sorted.
OP, I guess you have been asked by building control (England?), broadly adding a layer to the walls should help increase insulation valve (decrease U valve), but worth clarifying if they want the U valve calc' before and after for the wall element OR the whole house?
If wall element you just need a U valve calc, but check what level they need, i.e. free calc off internet or show your workings! OR do they want the whole house SAP?
Also look at what type of render (cement based or lime), adding any insulation (separate or in the render) and how think, plus check detailing around services, windows, doors and roof lines etc.
In essence you can always chance your arm, but if/when you come to sell etc, it's good to have your certificates in place:)
https://protonsforbreakfast.wordpress.com/2022/11/07/what-to-do-on-the-coldest-day-of-the-year/
Worth reading this? Set constant temperature inside the house, read the gas meter start and end of a 24h period and compare inside-outside temp against energy used? I’ve been meaning to have a crack over Christmas.