Click to view attachment
Hi everybody, after about 2 months of reading I am finally going to set up a grow room in my loft, got an area roughly WxDxH 205cm x 165cm x 210cm at the highest apex. I am thinking of pinning some b+q aluminium thermo foil to the existing rafters then cross battening , 70mm insulation board , 6mm ply / hardboard then some diamond reflective sheeting, by cross battening there will be some air circulation around the grow room. As for a system I am going for a
Gt424 nft
Supernova 600w
Glowlux dual spectrum 600w
Easy-rolls
Maxiswitch 2-way 10A
Ruck 125a
Matching filter
Acoustic ducting
50 watt tank heater
Bluelab truncheon
Ph pen
Canna aqua Vega
Canna aqua flora
Does this sound about right for an area that size? Any advice before i get started would be more than welcome.
thanks

good luck mate im in the middle of a growbuild in the loft
have a peak in my signature
Roach

Lo hicksy20, that space you have looks ideal.

I just did a rough tot up on wattage, the room is approx 38 sq/ft, with the 2 x600w you'll have just over 30w per sq foot, ideally you want to be somewhere between 40w-50w,closer to 50w if you can.

Adding another 400w will give you just over 40w per sq ft, adding another 600w will give you close to 50w per sq ft.

Also you only have 1 fan, so are you planning a passive inlet ? If you are, then you should reconsider, because the 2x600w's+ is going to give off a lot of heat, without fresh air being pumped in you may suffer from high temps, which is not advisable.

Apart from that, looks very good, with 1200w-1800w in lighting, and the right air movement, you should be aiming for 40-65 ounces, 1 grow per year, thats your percy sorted mate.

Keep us updated mate

e2a: Maybe you could do with putting a slimeline 100L water butt up next to your GR mate, makes life A LOT easier, just fill it with a ose pipe from your bathroom, thats waht I do anyway.

Youve got enough space to put 3x gt424's in there, if you want to keep it at 1x gt424 then maybe partition half the room off, maybe have a veg room and flower room, because that rooms to big for 1x gt424 tbh mate.

Thanks for the replies, sorry stealth should of been a bit more clearer with my set up the grolux 600w is the bulb I will be putting into the supernova reflector... my bad ( i will edit asap ) i was thinking of only having 1 fan and pasive vents from the loft space which is vented via 3 roof vent tiles.. Can’t decide whether to extract into loft or up through chimney. Would be grateful if you could do a tot up on 1 light. Will be reading your thread tworoach asap it’s a big 1. will keep thread updated with pics over next few weeks.

Its a fair space you have there hicksy.... should be a great adventure

38/600 = 15w per sq ft.

I think it would be better to partition the room in half, from the ridge (middle of the roof) down.

Use total blackout for the partition wall, this will stop light leak, then you can have a veg/utility room, alongside the bloom room.

This way you'll get 30w per sq ft from that single 600w, which is close enough to get a decent enough crop.

as said i'd partition it and have a grow/flower set up , area is massive for just 1 600. use plasterboard instead of ply to line it cheaper and gives you 30 mins in case of fire.

Also...

The 3 roof vents will be fine for a passive intake, but try and runn a length of ali ducting from one of the vents into the bottom of the GR, then the RVk125 will be able to pill fresh air directly from the roof vent.

Hey up m8 an welcome to the site bro .


Iv done quite a few loft builds mucka if you look in my sig below you'll see one hope this might be of some use to ya fella

I used the the B&Q foil backed bubble wrap for all of it, walling, insulation and reflection.... seen the same stuff used in lots of other peoples grow room and bud shots as well, you just staple the end to the floor or roof timber and stretch tight.... It's equivalent to 75mm of EPS insulation, you tape up the joints to seal up the room using foil tape... I also use passive intakes and vary the ones I use depending on where I pull the air from, house in winter, eaves in summer..... its easy to cut in passives with the insulation and you can tape up the ones you aren't using when ever you want.... you'll be up and running in a few hours.... your wattage sounds a bit low for the space though, I run twice that in less floor area and height.... vent into the airspace it will help keep the room warmer as long as you don't suck in the same CO2 depleted air

Maybe something like this..........

@Billious
i think there doing that stuff 2 for 1 at the moment in BnQ and its interesting what you say about its the equivilent of 75mm EPS insulation (what is that exactly)
i may get some my self if its as good as 50mm kingspan?
Roach

EPS is Expanded Polystyrene Slab.... the bubblewrap foil has got great insulation properties they are using it as the cavity insulation in lots of builds up here so it must meet the heat loss requirements... i Used the more expensive silver blanket to line out the entire attic recently... toasty now and seemed to keep it from overheating in the summer... or that could be that we had no summer!

Hey up

Is that chimney stack in use?

I was thinking you could intake from the stack and extract filtered air into remaining loft space

Not sure 1 x 125 fan will be enough especially in summer

hb

So would you say its better to have 50mm kingspan lining the inside of a box or the bubble wrap? my roof is uninsulated at the moment and i want 0% heat loss from the box - i dont want it looking like a big hot box through the tiles

That looks interesting when you say a veg room is that somewhere you grow from seed? not looked into that much as i was going to grow from cuttings. Partitioning will have to be the way forward i think as funds are limited. Where do you get the software to do those drawings??



Yeah 2 4 1 on all rolled insulation i got 4 rolls of thermo wrap for £40 will do about 18 m2


chimney not in use for now recently removed fire in lounge and blocked it in due to having new central heating fitted and a nasty draft coming in..

Veg room will be on a veg cycle, so you can use it for all vegging plants like a mother plant, clones, or seedlings.

I would just take cuttings from your bloom room just before you put them into 12/12, then put these cuttings in a propogator in the veg room, do this every time and you wont need a mother, depends if you want to try different strains or stick with one strain. Either way a veg room/box is ideal.

The software is just photoshop cs3 mate.

The foil stuff from b&q has a thermal resistance of 1.455W/M2K while kingspan @ 50mm has a resistance of 2.24W/M2K, so kingspan is more efficient... but both are high scoring... the foil is far cheaper though than kingspan and easy to work with + if you double up the bubble at the top of your growroom the 14mm of insulation will give you nearly 3W/M2K between your room and the tiles

how much is the foil bubble wrap per m2? looks good if its cheap

Another advantage of thermal foil stuff is it's easier to work with and fits through the loft hatch more efficiently.

is there a way to save your post for future reference? i may forget where it is... but thats very informative thankyou

And a very good point JGP hmmm i may just get this stuff instead of kingspan now and double it up on the roof of the growbox like Blillious said

Add this link to your favs..

http://www.uk420.com/boards/index.php?s=&a...t&p=1966070

ok thanks stealth , definately going to patition off for the time beign until i can afford to fit another tray and lights in, what lighting would i need for the veg room? and rougthly how many plants would be ideal in the patitioned flower room under 1 600w in a gt424 nft , going try and do it sog or scrog... me thinks

Click to view attachmentHere is a couple of before shots of loft space...

Click to view attachment

Click to view attachment

Click to view attachment

Click to view attachment
Just another qucik question anybody , i am struggling to decide the width of the grow room because of the hight which gets smaller because of the roofs pitch ... going to be putting a gt424 nft in which is about 21cm high then my plants under a scrog screen which is about another 26cm then the distance between that and the light and then the reflector which is about 19cm high and 44cm wide ( i dont want to get the reflector to close to the wall ) it is the min - max hight from the bottom of the tray to the top of the reflector and the space around the edge of the tray which is 50cm i need to sort out. I am probilly going to drag the growroom outside wall in a bit and shrink the veg room,, any advice please
Sorry i pinched your pic stealth67 - Yours is better than mine

Hicksy have a look at my sig mate - i had the exact same problem as you and putting a peak on my box has added some much needed height.... it may be of help to ya

looking good tworoach .. your chippying work is alot better than mine, mine are ,, going to copy your door design if you dont mind... are you splitting yours into veg - flower and which way are you laying yours tray/trays mate,

no veg room - just gonna veg then flower in the same room mate.
Please do take the door idea - A stick on (velcro) or slide on doors were my only options due to space...

the floorspace is 1250mm x 1300mm and the NFT will lay like this in the box....... note ive left a big enough gap on the right side so i can get round the back of the NFT
Click to view attachment
not sure what side my CF will go but thats the plan..

You dont have to have a veg room, but if you carry on growing, you will likely decide later on that you do need a veg room of some kind.

If you dont go with a veg room, and you decide to move the NFT under the ridge into the middle of the room to make use of the 2 meters of head room, thats fine, but you will need to make the room a little bit smaller, or add another light.

As Stealth says



Thats what i ended up doing - moved the NFT bang under the peak and measured from there
Have fun anyway

Click to view attachmentThink i like the idea of splitting it.. cant go back now as i have started to put up framework and the layer of thermol foil which will be crossed battoned and then insulation board. Does these measurment look ok now,, still only got 1 600w and the tray is a gt424.

Click to view attachmentfew pics

Click to view attachment

Click to view attachment

Click to view attachment

Looking good mate.

The new layout will give you 30w per sq ft, you can get by with that ok, but if you added a 400w you would get 50w per sq ft.

Maybe do the first grow and see how you get on, you may decide to add another light for the next grow ?