Hello all,
I have spent the last 6 months on and off researching home efficiency improvements. I have read allot and have learnt allot, with a number of headaches along the route lol, but I still consider myself a newbie and I certainly still struggle with the building industry technical terms, so please excuse me if any of my wording confuses matters.
My first job was to clear out the loft, get rid of the old rockwool, re-jig the lighting ciruit wiring to lay below or along the joists so no electrical wiring is crossing over the joists and add a light up there.
Form that point I started thinking insulation......following some research I settled on a compromise and bought Thermafleece ECOGreen loft insulation (recycled plastic fibre wool). I layed 100mm between the joists across the whole loft space and then layed a further 150mm across the joists in the space behind the purlins where the roof pitch makes the space unsuable.
The centre space where the chimney stack is located currently only has 100mm and that space occupies 29m square. I would like to insulate this space but also make it walkable so house items can be stored there long term.
After allot of research on the subject I have again concluded on a compromise. Below I will outline my plan and I would like to hear some opinions on whether I am overlooking any serious detail, as I certainly do not wish conciously to bring the house down
Joists are measured at 3x2" and I believe they sit across a load bearing wall at the centre of the house which the chimney stack is also attached to.
I have measured the space I am looking to work on at 7M width (across joists) and 1.7M length (along joists) at either side from the centre which add up to the 29M square area.
My intention is to place a 6mm WBP plywood measuring 2440x1220x6 across the joists, and cut to fit. The total weight of each sheet is 11Kg which equates to 11Kg over 2.98m square area. I have calculated to require a total of 6 sheets to cover each side of the 7Mx1.7M area, so this will add a total of 66Kg (including the wasteage) of weight on the joists on each side.
My intention for the 6mm plywood is to form an even load area for some Kinspan TF70 PIR rigid board which I intend to then lay on top. I was planning on using 100mm thick slabs to achieve the same level of insulation applied via the ECOGreen stuff.
To finish, as per Kingspan's reccomendation to sandwich the PIR, I was thinking of adding a 3mm plywood on top and end up with a SIP like panel, but a significantly lower total weight compared with a similar sized SIP panel which I was told weighs in the region of 100-110Kg
Based on the these materials and roughly summed up, 4Kg per m2 = 6mm plywood. 2Kg per m2 = 3mm plywood and the TF70 around 3.5Kg per m2 based on a confirmed weight per slab of 14Kg. The total weight added per m2 will be roughly around 10.5Kg.
The sanity here is, is this the lightest possible way to achieve a hardboarded and insulated storage area, but more importantly am I going to be asking too much of the 3x2 joists, despite each section backing onto and being separated by a load bearing wall in the centre?
My budget for this is around the 700-800 mark based on using the Ply-PIR-Ply materials.
Hum
I have spent the last 6 months on and off researching home efficiency improvements. I have read allot and have learnt allot, with a number of headaches along the route lol, but I still consider myself a newbie and I certainly still struggle with the building industry technical terms, so please excuse me if any of my wording confuses matters.
My first job was to clear out the loft, get rid of the old rockwool, re-jig the lighting ciruit wiring to lay below or along the joists so no electrical wiring is crossing over the joists and add a light up there.
Form that point I started thinking insulation......following some research I settled on a compromise and bought Thermafleece ECOGreen loft insulation (recycled plastic fibre wool). I layed 100mm between the joists across the whole loft space and then layed a further 150mm across the joists in the space behind the purlins where the roof pitch makes the space unsuable.
The centre space where the chimney stack is located currently only has 100mm and that space occupies 29m square. I would like to insulate this space but also make it walkable so house items can be stored there long term.
After allot of research on the subject I have again concluded on a compromise. Below I will outline my plan and I would like to hear some opinions on whether I am overlooking any serious detail, as I certainly do not wish conciously to bring the house down
Joists are measured at 3x2" and I believe they sit across a load bearing wall at the centre of the house which the chimney stack is also attached to.
I have measured the space I am looking to work on at 7M width (across joists) and 1.7M length (along joists) at either side from the centre which add up to the 29M square area.
My intention is to place a 6mm WBP plywood measuring 2440x1220x6 across the joists, and cut to fit. The total weight of each sheet is 11Kg which equates to 11Kg over 2.98m square area. I have calculated to require a total of 6 sheets to cover each side of the 7Mx1.7M area, so this will add a total of 66Kg (including the wasteage) of weight on the joists on each side.
My intention for the 6mm plywood is to form an even load area for some Kinspan TF70 PIR rigid board which I intend to then lay on top. I was planning on using 100mm thick slabs to achieve the same level of insulation applied via the ECOGreen stuff.
To finish, as per Kingspan's reccomendation to sandwich the PIR, I was thinking of adding a 3mm plywood on top and end up with a SIP like panel, but a significantly lower total weight compared with a similar sized SIP panel which I was told weighs in the region of 100-110Kg
Based on the these materials and roughly summed up, 4Kg per m2 = 6mm plywood. 2Kg per m2 = 3mm plywood and the TF70 around 3.5Kg per m2 based on a confirmed weight per slab of 14Kg. The total weight added per m2 will be roughly around 10.5Kg.
The sanity here is, is this the lightest possible way to achieve a hardboarded and insulated storage area, but more importantly am I going to be asking too much of the 3x2 joists, despite each section backing onto and being separated by a load bearing wall in the centre?
My budget for this is around the 700-800 mark based on using the Ply-PIR-Ply materials.
Hum
