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Thread: Primes 2019 loft build

  1. #1

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    Default Primes 2019 loft build

    Gday cobbers

    Just going to start a post about my planned loft build. Since I started my journey as a cannabis grower I have pretty much been in the same size grow space, 90 X 90 under either a 600 or a 400w bulb. The tent is hidden in a wardrobe, however, now my eldest lad is talking about growing strawberries and I've become a bit panicked. All it takes is one comment from him in school about his dad's strawberries and I'm fucked.
    Soooo... It's time to move upwards and onwards to the loft where he has no access, nor does anyone else. The loft hatch is tiny, so it's not somewhere that can be used for storage normally, I literally have to fold myself in half to get up there. The landlord has never in 8 years been up there once, due to the acrobatics involved in gaining access. There is a defunct cold water tank, however, cold water supply can be easily reinstated and drainage can go down the old overflow.
    As it's an old loft, temps are entirely dependent on the outside weather, scorching hot in summer, freezing in winter.
    This is gonna be a pain in the arse to build, trying to make an well insulated, sealed grow room but if I wanna carry on growing it needs to be done.

    The loft space is obviously triangular, as it's below the roof, but the usable space is still 3m X 2m. Plenty big enough to have veg, flower and cuts all in there in separate chambers.
    Depending if I can find a suitable size loft tent I could possibly make the raised floor and then tent up and insulate that, as opposed to having to make walls and mylar. Think tent option is the best.

    I'm contemplating venting straight out of chimney too, maybe air cooled lights so the lighting ventilation is on a separate run from the grow chambers, which I would prefer to be a sealed unit should I ever need to get an Aircon or something if it gets too hot in summer. During last summer when football was coming home, temps in the tent got up to 39c, plants were truly stunted and set back weeks because of it.
    Anyway I'll post pics of my ideas later on

    Let's roll
    When you do things right, people wont be sure you've done anything at all.

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  3. #2

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    I’ve been contemplating building a loft grow room for ages. I have a 1.2m x 1.2m loft tent with a air cooled light. I tried to grow in there last summer and temps were still high 30’s to have any real control over your environment in the summer months A/C is the way. Also being such a small loft hatch how you planning on getting Materials up there? Lol.
    Good luck anyway


    Please check out my diary.

    Cinderella jock and 1 other
    https://r.tapatalk.com/shareLink?sha...5&share_type=t

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    I've built a few loft grow rooms in my time any help ya need give us a nudge and check my journal out at the very beginning of it I started my build. British green gets down and dirty
    https://r.tapatalk.com/shareLink?sha...4&share_type=t


    in a green and pleasant land

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    As BG, Ive built a few for others too...will sit in on this one

    PIR Insulation is your friend, you'd be amazed at the difference even with just 50mm

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    Cheers mate, I'm sure I'll be bending your ear at some point

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    Just checked out yours mate, very similar to what I'm planning, very nicely done.. A suspended floor from the 2 roof beams. My span between the 2 beams is 2.8m though so I'm gonna have to support the centre from the top of the internal wall that's centre of house, pretty much dead centre between the beams. Hoping to have a low height of 1.8m before it starts sloping upwards with the roof to 2.0m highest.

    Think with the awkward access I'm gonna be in for some fun. Loft boards go up ok for flooring, sure I can manage to get 2.4m lengths of 2x4 up somehow, maybe not. Getting kingspan would involve much cutting so gonna use reflective bubble foil under the slates to reduce radiative heat gain from the slates in summer. Under that I'll leave a small void and theñ use Rockwool to insulate against conductive heat on the outside of the tent or structure I build if tent is a no go. I've not read all your diary yet, is venting through the chimney ok security wise. I'm planning on air cooled lights so the fan pressure wouldn't need to be very high I wouldn't think, maybe a 4 inch ruck which I already have.

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    Quote Originally Posted by prime View Post
    Just checked out yours mate, very similar to what I'm planning, very nicely done.. A suspended floor from the 2 roof beams. My span between the 2 beams is 2.8m though so I'm gonna have to support the centre from the top of the internal wall that's centre of house, pretty much dead centre between the beams. Hoping to have a low height of 1.8m before it starts sloping upwards with the roof to 2.0m highest.

    Think with the awkward access I'm gonna be in for some fun. Loft boards go up ok for flooring, sure I can manage to get 2.4m lengths of 2x4 up somehow, maybe not. Getting kingspan would involve much cutting so gonna use reflective bubble foil under the slates to reduce radiative heat gain from the slates in summer. Under that I'll leave a small void and theñ use Rockwool to insulate against conductive heat on the outside of the tent or structure I build if tent is a no go. I've not read all your diary yet, is venting through the chimney ok security wise. I'm planning on air cooled lights so the fan pressure wouldn't need to be very high I wouldn't think, maybe a 4 inch ruck which I already have.
    Venting through the chimney is fine as long as it's not used .


    in a green and pleasant land

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    Only used as a perch for the local pigeons

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    Quote Originally Posted by prime View Post
    Just checked out yours mate, very similar to what I'm planning, very nicely done.. A suspended floor from the 2 roof beams. My span between the 2 beams is 2.8m though so I'm gonna have to support the centre from the top of the internal wall that's centre of house, pretty much dead centre between the beams. Hoping to have a low height of 1.8m before it starts sloping upwards with the roof to 2.0m highest.

    Think with the awkward access I'm gonna be in for some fun. Loft boards go up ok for flooring, sure I can manage to get 2.4m lengths of 2x4 up somehow, maybe not. Getting kingspan would involve much cutting so gonna use reflective bubble foil under the slates to reduce radiative heat gain from the slates in summer. Under that I'll leave a small void and theñ use Rockwool to insulate against conductive heat on the outside of the tent or structure I build if tent is a no go. I've not read all your diary yet, is venting through the chimney ok security wise. I'm planning on air cooled lights so the fan pressure wouldn't need to be very high I wouldn't think, maybe a 4 inch ruck which I already have.
    Make a hole at top of stairs to get materials up, repair when done

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    Yeah I may have to do. Hopefully not.

    Click image for larger version. 

Name:	IMG_20190119_171712416.jpg 
Views:	42 
Size:	71.0 KB 
ID:	369349
    The pic from inside the loft with the large bean I will be suspending off. Unsure of whether to use 2x4 as the droppers or flat metal

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    Fair play mate. I just run cross beams and then boarded over them. Going the whole hog on this. I salute you. I used kingspan for mine, I had it for next to nothing though so it made sense. And it is pretty good too. Loft is freezing, room is toasty. Wish I had an unused chimney to vent to. I’m venting into the en suite and keeping the window a jar to let it out that way. And praying no Mold appears.


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    Well it's been a fair old while since I updated this post. I'm happy to say that for once, my plans came to pass.
    It took a while to get all the bits together but I managed to get it all done and now I have a large loft grow room, seperate veg and flower chambers, extraction and intake through chimneys ( seperate flues, one out one in).
    It is insulated with bubble foil/ 20mm rockwool/ tarpaulin/ mylar. The ceiling is also bubble foiled again. Time will tell whether it's enough to keep the frost on in winter, but I hope so. I have a 150 ruck extraction, air cooling my two 600 parabolics. I have a 100mm ruck, sucking cool air in, with an odorsok fabric carbon filter as a filter against chimney dirt.
    My veg/ prop area is 2.5 ft X 3.5 ft, there is a similar sized area for storage and the loft access.
    My flower area is almost 7ft x 7ft. Currently I have 8 plants under the two parabolics and they look like my best ever. Temps can get quite high though, leaf temps of 27c. Defo need LEDs at some point. Gonna be expensive though : (
    At night it still gets chilly, dropping down to 10c, so come late flower I'll need to move the dehumidifier up there to warm it and reduce the chance of bud rot.
    I have 4 strains, lemon haze, cheese, tangilope and a small critical super silver haze in a 3 litre air pot. Tangilopes are in 18 litre fabric pots and haze and cheese in 30 litre fabric pots. Bat mix and biobizz, organics all the way.

    Come again, sorry I don't have build pics

    Sent from my VOG-L09 using Tapatalk

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  25. Default

    Quote Originally Posted by prime View Post
    Well it's been a fair old while since I updated this post. I'm happy to say that for once, my plans came to pass.
    It took a while to get all the bits together but I managed to get it all done and now I have a large loft grow room, seperate veg and flower chambers, extraction and intake through chimneys ( seperate flues, one out one in).
    It is insulated with bubble foil/ 20mm rockwool/ tarpaulin/ mylar. The ceiling is also bubble foiled again. Time will tell whether it's enough to keep the frost on in winter, but I hope so. I have a 150 ruck extraction, air cooling my two 600 parabolics. I have a 100mm ruck, sucking cool air in, with an odorsok fabric carbon filter as a filter against chimney dirt.
    My veg/ prop area is 2.5 ft X 3.5 ft, there is a similar sized area for storage and the loft access.
    My flower area is almost 7ft x 7ft. Currently I have 8 plants under the two parabolics and they look like my best ever. Temps can get quite high though, leaf temps of 27c. Defo need LEDs at some point. Gonna be expensive though : (
    At night it still gets chilly, dropping down to 10c, so come late flower I'll need to move the dehumidifier up there to warm it and reduce the chance of bud rot.
    I have 4 strains, lemon haze, cheese, tangilope and a small critical super silver haze in a 3 litre air pot. Tangilopes are in 18 litre fabric pots and haze and cheese in 30 litre fabric pots. Bat mix and biobizz, organics all the way.

    Come again, sorry I don't have build pics
    Sent from my VOG-L09 using Tapatalk
    Very nice prime, well done man..and those LEDs will be a great investment for summer time up the loft for sure

    Girls looking very healthy as always.

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    Quote Originally Posted by prime View Post
    Well it's been a fair old while since I updated this post. I'm happy to say that for once, my plans came to pass.
    It took a while to get all the bits together but I managed to get it all done and now I have a large loft grow room, seperate veg and flower chambers, extraction and intake through chimneys ( seperate flues, one out one in).
    It is insulated with bubble foil/ 20mm rockwool/ tarpaulin/ mylar. The ceiling is also bubble foiled again. Time will tell whether it's enough to keep the frost on in winter, but I hope so. I have a 150 ruck extraction, air cooling my two 600 parabolics. I have a 100mm ruck, sucking cool air in, with an odorsok fabric carbon filter as a filter against chimney dirt.
    My veg/ prop area is 2.5 ft X 3.5 ft, there is a similar sized area for storage and the loft access.
    My flower area is almost 7ft x 7ft. Currently I have 8 plants under the two parabolics and they look like my best ever. Temps can get quite high though, leaf temps of 27c. Defo need LEDs at some point. Gonna be expensive though : (
    At night it still gets chilly, dropping down to 10c, so come late flower I'll need to move the dehumidifier up there to warm it and reduce the chance of bud rot.
    I have 4 strains, lemon haze, cheese, tangilope and a small critical super silver haze in a 3 litre air pot. Tangilopes are in 18 litre fabric pots and haze and cheese in 30 litre fabric pots. Bat mix and biobizz, organics all the way.

    Come again, sorry I don't have build pics

    Sent from my VOG-L09 using Tapatalk
    Sounds and looks like you’ve done a banging job here mate. Some lovely good girls you have.

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    Quote Originally Posted by IceCalibur View Post
    Very nice prime, well done man..and those LEDs will be a great investment for summer time up the loft for sure

    Girls looking very healthy as always.
    Cheers mate.
    It's also got a cold water tap, I removed old cold tank and used the supply, and added plastic push fit pipe and brass tap to suit. Only thing I lack is a waste water drain, but can't have everything eh. I really need to tidy my electrics too. They are safe but im running an extension from bedroom, through loft hatch which looks suspicious. Just need to drill hole and clip it in a more inconspicuous place.
    I think there is no way I could grow in summer with the HPS. Even the last few days of summer when the build was in progress it was still warm. Laser thermometer was a good purchase. I also need to go up before lights on one morning and see if I have any cold bridges, to let me know if the insulation is still where it's supposed to be.

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  31. #16

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    And yes mate, the girls are stunning, thank you. H and g batmix, and fed potsil silicon and biobizz nutes. Also the mycorr hydro for beneficial mycorr and bacterial beasts. Can't fault the stuff mate.
    Without the potsil the pH would be far too low for my liking, with just the biobizz bloom, algamic and topmax. Comes in at 5.6 but with potsil first it's a nice 6.5

    Sent from my VOG-L09 using Tapatalk

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  33. #17

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    Quote Originally Posted by LewisR19 View Post
    Sounds and looks like you’ve done a banging job here mate. Some lovely good girls you have.
    Thanks mate. Was a pain in the arse to build, but well worth it.
    I was lucky that a mate gave me an old 2x2 tent to reuse the mylar. The floor is covered with a tarp and the tent mylar flooring, so nice and water proof.

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    Quote Originally Posted by prime View Post
    Thanks mate. Was a pain in the arse to build, but well worth it.
    I was lucky that a mate gave me an old 2x2 tent to reuse the mylar. The floor is covered with a tarp and the tent mylar flooring, so nice and water proof.

    Sent from my VOG-L09 using Tapatalk
    I’d love a loft grow room, but the mrs won’t let me no matter what I say

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