Cold in Winter - in a place that has wild Kangaroos ? Where on earth are you? Underfloor insulation is reputed * to improve things considerably here (Chch, NZ). Part of that is due to drafts through the flooring though - not a problem in your case. If you have a high glass to wall ratio then double glazing would be big help too. Or heavy curtains for winter & outside shade cloth or other cover to prevent direct sun for summer. Make sure there are no drafts through doors and windows - again probably not an issue due to the wasp situation. Also, do you get a big difference in temperature between the floor & ceiling? Would fans help to keep the air mixed top to bottom (in addition the the heat pump fans) * We are on a concrete slab directly on the ground and I don't have personal experience re the underfloor. RP On 22 February 2018 at 20:13, Justin Richards wrote: > My folks recently installed sheets of insulation from left over cool room > panels underneath thier wooden floor stumped house. > Will ask them if they noticed an improvement. > The also experience wide swing in temp with roos, wasps and snakes. Not t= he > high winds however. > > > On 22 Feb 2018 11:14, "James Cameron" wrote: > > G'day, > > I'm living in a corrugated steel shed, and it's too hot in summer and > too cold in winter. > > Walls are double clad zinc plated steel, with a polyester wool > insulation around steel framing. Roof is steel plated polystyrene > insulated panels, 100mm thick. Windows and doors are aluminium framed > single glazed. > > Heat pumps have worked well to moderate, but the IR probes and bare > feet show the heat is mostly leaking through the floor; with four hour > lag, apparently normal for the 100mm thickness. > > The floor is bare concrete, about 200 sq m. One room has carpet. > > The concrete was poured onto 0.42 to 0.48mm mean-thickness steel > roofing [1], which rests on 125mm x 75mm steel bearers, separated by > about 2.2m. > > Bearers are welded to steel posts of 75mm x 75mm x 1.2m each resting > on a 1 sq m concrete foundation block. > > A photograph underneath is available on request; just don't want it > archived. Will reply by private mail. > > Unimpeded airflow under the shed, which is 1.2m off the ground. The > air exchanges heat with the zinc plated steel under the concrete. The > profile of the steel has long troughs that act like heat sink fins. > > We're thinking of adding insulation underneath. We have a product in > mind [2]. > > Environmental risks are; high speed wind (~60km/h), leaping male > kangaroos (about one a year), birds looking for nesting material, and > a wasp for every size hole. > > Obligatory PIClist data; we have DS18B20 sensors in several rooms, > with one for the concrete and one buired 500mm into the ground > underneath the shed. Data collected once a minute by PIC 12C509, > ESP8266, and ATmega328. > > Listening for your thoughts. ;-) > > > References: > > 1. KLIP-LOK CLASSIC 700, page 9 of > http://www.lysaght.com/sites/default/files/LysaghtRoofingWallingInstallat > ionManualJul2015.pdf > > 2. PIRMAX HR Panel 100mm, polyisocyanurate with al foil facing, > https://reflexinsulation.com.au/products/pirmax-hr-panel/ > http://reflexinsulation.com.au/wp-content/uploads/Reflex- > PIRMAX-HR-PANEL-Technical-Brochure.pdf > > -- > James Cameron > http://quozl.netrek.org/ > -- > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > -- > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .