insulate a loft...
- Thread starter 2cent
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coreywebster
Well-Known Member
You could use recticel cut to fit tightly between the rafters though im not sure £100 would be enough.
Leeski
Well-Known Member
I did my loft with these
www.insulationexpress.co.uk
Celotex TB4000 Insulation Board
Celotex TB4000 is an easy to install polyisocyanurate (PIR) insulation board with excellent thermal performance, featuring a low emissivity foil facing. Available in thicknesses from 20mm to 40mm, it can be considered for floor, wall, and roof applications...
www.insulationexpress.co.uk
coreywebster
Well-Known Member
I did my loft with these
Celotex TB4000 Insulation Board
Celotex TB4000 is an easy to install polyisocyanurate (PIR) insulation board with excellent thermal performance, featuring a low emissivity foil facing. Available in thicknesses from 20mm to 40mm, it can be considered for floor, wall, and roof applications...
That's a better material for sure. What did it cost you all in?
Leeski
Well-Known Member
I was lucky as I brought most of them used off eBay for about £50 I think and had to buy another 3 or 4 new ones it’s really easy to work with did my loft in a day did make school boy error and didn’t measure loft door properly DOH
jondamon
Well-Known Member
Personally I would be asking what are you doing with all the warm air coming out of the tent?
If this is going into the loft area you’ll need an exit point so make sure you factor that into your plan.
If you just dump all the hot air from the tent into the loft area, the entire area will heat up (even more so if it’s insulated well) and then your tent will heat up as the ambient air temp being sucked in will be progressively getting warmer during the lights on cycle.
have you thought about this?
if all this has been thought of then spend your money on insulating the external of your tent.
it will be a smaller area to control which means you should get less hi and Lo spikes.
intake from a clean air source And exhaust away From your tents location and you should be golden.
then if you want to later down the line you can insulate the entire loft area.
Just my 2p worth
Moflow
Well-Known Member
19°C you say, why would you need insulation....? 
My MacGyver tent
All joking aside to keep cost down just insulate the tent itself .
You could use Knauf insulation roll, fibreglass or Insulation boards as mentioned above, you can get seconds on ebay.
B$Q do that silver bubble insulation foil at various prices. There's polystyrene boards too. Jablite it's called
I doubled the silver bubble wrap and made an air gap in it for better insulation.
This tent above is in a corner of a freezer.., I mean un insulated garage so the 2 sides in the corner have 2" 50mm pir board on them.
The roof has 2" 50mm board on top of it covered with the silver bubble wrap and the yellow garden cushions are full of polystyrene beads.
The floor of tent is insulated too with a heat mat under the pots.
~ 22°C lights on
My MacGyver tent
All joking aside to keep cost down just insulate the tent itself .
You could use Knauf insulation roll, fibreglass or Insulation boards as mentioned above, you can get seconds on ebay.
B$Q do that silver bubble insulation foil at various prices. There's polystyrene boards too. Jablite it's called
I doubled the silver bubble wrap and made an air gap in it for better insulation.
This tent above is in a corner of a freezer.., I mean un insulated garage so the 2 sides in the corner have 2" 50mm pir board on them.
The roof has 2" 50mm board on top of it covered with the silver bubble wrap and the yellow garden cushions are full of polystyrene beads.
The floor of tent is insulated too with a heat mat under the pots.
~ 22°C lights on
jondamon
Well-Known Member
You mean besides the powerful grow light in a material tent, fire risk, nothing we do is without risk.
For example. It’s easier to control the environment of a room within a room.
think of it this way.
if your tent was in a bedroom it’s easier to control the tent temperature because your bedroom is in a stable environment.
By creating a small box room within your loft you are making a smaller environment to stay in control of.
if the ambient temp of your loft on an average Day is 16C then the external material of your tent will be 16c meaning that the walls will be cool.
if you ambient temp of your loft is 24C then the walls of your tent will be 24C meaning they are giving back heat into the room that you need to deal with.
By creating a room in your loft space you are in effect double insulating your grow tent.
this will have even more benefit if you eventually insulate your entire loft space.
it’s great that you’re intaking air from your house. Step 1 complete.
it’s great that you are exhausting out of a tile vent in the roof. Step 2 complete.
step 3 is to now make sure you can Control the tent environment even if the ambient loft temperature is 7C or whether it’s 27C.
By creating an extra skin around your tent will help you to control this.
you will want an air gap between the external skin and the walls of your tent.
This way there is an air layer to dissipate external loft temperatures.
Personally if you have the means and the skill to build it then this is the route I would go down making sure you insulate the new room to house your tent.
by doing it this way you’ll be able to control the environment via your intake air temp and by how much exhaust you run etc.
If your intake air temp is always 19C then you can guarantee (as long as you’ve spec’d you’re fan and filter correctly) you’ll be able to control the temp within 21-27C.
most people don’t use the right sized Fan and filter combos though, as most people don’t add 20% extra fanpower for a filter attached, 10% for every bend in ductwork, 10% for every 5m OF ducting, 10-20% depending upon light choice etc.
personally to control my room I use the following.
400w digi ballast
400w MH/HPS
Adjust a wing open reflector
RVK150A1 Fan 460m3/h
SMS FAN SPEED CONTROLLER set to 22C and kept out of direct light
RhinoPro 900m3/h carbon filter.
Tubular Heater (timed to come on dark cycle)
Dehumidifier (when req)
Humidifier (when req)
OSc fan
I have screened external intakes and I exhaust into my well ventilated loft space.
my room is a storage cupboard within my house upstairs that I have Adjusted and adapted to suit my needs.
I use my 400w over a 3ft x 3ft floor space but my room is 3.3ft W x 7ft L x 8ft H
In your situation the only true way of knowing for sure is to set your tent up and run it to see hi’s and Lo’s and then do it again if you build the box around it and insulate.
sorry this is long winded lol.
just wanted to make sure you had the full picture.
2cent
Well-Known Member
Love it. Sometimes we just need to recap with a fellow stoner lol
Doin 100mm rockwool in rafters plasterboard ontop now
