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    Default Loft

    Hey there people,

    Who grows in the loft or who vents into the loft using 2 or 3 600w HPS lights? I’m looking for some advice.

    I’ve got a spare below and my intentions was to use the full room and vent up there I’ve been up and looked for vents and can’t see any (it’s an old council built pit house). There doesn’t look to be a chimney breast as such the walls are pretty flat all the along up there unlike the bedroom below where you can see an actual chimney breast come out from the wall and then the living room below. There is however some bricks that sort of arch. (I could take pics)

    So my question is does any vent straight into the loft using 2 or 3 600s in an uninsulated loft?

    Also is there any builders here who could answer if chimneys are shared?

    Thanks Marley
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  3. #2

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    Default

    Quote Originally Posted by Marley13 View Post
    Hey there people,

    Who grows in the loft or who vents into the loft using 2 or 3 600w HPS lights? I’m looking for some advice.

    I’ve got a spare below and my intentions was to use the full room and vent up there I’ve been up and looked for vents and can’t see any (it’s an old council built pit house). There doesn’t look to be a chimney breast as such the walls are pretty flat all the along up there unlike the bedroom below where you can see an actual chimney breast come out from the wall and then the living room below. There is however some bricks that sort of arch. (I could take pics)

    So my question is does any vent straight into the loft using 2 or 3 600s in an uninsulated loft?

    Also is there any builders here who could answer if chimneys are shared?

    Thanks Marley
    I have just started doing this before I find a more permanent solution

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  5. #3

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    Default

    I vent into my loft but only run a single 250w HPS
    It's Not What You Know, It's What You Can Prove...”

    (Alonzo Harris)


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    Thanks roooot. What light/s you using? Having you noticed any increase in temp up there? Is it insulated?

    Yeah MC I know you do but 250. Currently what I’ve got on at the min but looking to up the wattage. Got an 8” hyper fan today

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    Quote Originally Posted by Marley13 View Post
    Thanks roooot. What light/s you using? Having you noticed any increase in temp up there? Is it insulated?

    Yeah MC I know you do but 250. Currently what I’ve got on at the min but looking to up the wattage. Got an 8” hyper fan today
    I had 3x 600w before now I added 1 extra but will probs run at a lower wattage.

    Ive just changed the room and put the fan in the loft, not sure how well the air will disapate not been up there since I'm not even using my HPS atm (seedlings under CFL)

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    So you was actually venting air and heat from 3x600s into your loft? Was this during the summer or colder months?

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    Quote Originally Posted by Marley13 View Post
    So you was actually venting air and heat from 3x600s into your loft? Was this during the summer or colder months?
    No mate I was venting a 8inch fan out of a 4" hole before. But now I've just changed my room around and venting into loft atm

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    One thing no ones touched on about venting into a enclosed loft is neighbours.
    I can tell you by experience that be careful doing it if your house is a terrace or a end Terrance.
    Some of the old walls to separate you from your neighbour ain’t up to much in the loft and the next thing you know your neighbours asking why his loft stinks if he’s/she is nice enough to just tell you
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    You might find a old flu in the loft you can use to safely vent it out.

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    I have neighbours either side and one is definitely not on good terms although I’ve no idea why. With a carbon filter attached id have thought there wouldn’t be much of a smell although... can’t imagine they’d spend much time going into there loft.

    That’s what I was hoping to do is to tap into the chimney although have no bricky or construction knowledge to know what I’m doing. Would the neighbours chimney be joined.... there’s also no breast as such like the rooms below where an obvious chimney is. Just look like normal walls but they have like arched brickwork at each side of the house but on one side of the wall. So kind of like a letter r

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    I've vented into the loft a few times. It works well. Lofts aren't sealed, would be bad news for the house if they were. Any air pumped in will find its own way out. Don't vent into a chimney unless you know for absolute certain that there is no gas appliance connected to it and never will be. Carbon monoxide is deadly.

    I wouldn't worry about heat. I once vented 2 x 600w hps, 8x4 tent, from my cellar to my living room. About 1.5m of 8" ducting. The idea being to warm my toes in winter. Dismal failure. The breeze from the fan made the room feel colder if anything. A 400w halogen heater in the same room gave lots more heat.

    When using a spare bedroom, I marked the position of the joists with a pencil and made sure that there were no pipes or cables where I wanted to cut the plasterboard. With a pad saw, I cut a square in the plasterboard at a 45 degree angle. \________/. That piece was kept in the loft next to the hole. When needing to make good, the piece was dropped back into the hole. Not perfectly but a lick of paint hid the crime. Who examines ceilings? They all have irregularities.

    A piece of ply, with wall plate fitted, was screwed into the joists and taped up. To avoid using ducting, the filter was stood upright on a shelf with the fan taped to it. Enough polystyrene tiles etc. were used under the filter to have the fan a quarter inch shy of the wall plate. Then the fan was taped to the wall plate.

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    Thanks for the info there! Plenty.

    I’ve grown in cellars before and just vented through the house so never had an issue although it was always warmer lol.

    The chimney isn’t used there is no fire and I can part see the old flue pipe which I had hidden but left access for in case I wanted to get a log fire installed. The boiler is vented outside by its own flue not connected to the chimney in anyway. I wouldn’t know if the neighbours house is connected to the same chimney though.... not a clue on whether chimneys would be connected for joined houses. The problem is I wouldn’t know what bricks to knock out to find.

    My concern with venting straight into the loft is moisture and heat on the roof. It is pretty cold and seems crafty up there as they would be. The brick work looks unusual too

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  25. #13

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    I dunno m8 your house maybe set up different I definitely had problems with my neighbour smelling it even with a carbon filter. My house is old though & very badly insulated between houses.
    My next door neighbours wife hates the smell albeit they didn’t go running to the cops as they know it has medical properties & they know how badly I need it. he knocked saying they could smell it without going into the loft.
    That was a long time ago and as said I’ve very thin insulation you might not have.

    I run mine through a chimney it is shared however It’s blocked up on the walls so all that remains is the stack witch isn’t shared.
    It’s really hard to tell you without seeing what your dealing with.

    As for moisture I had no problems there as heat rises so the lofts dry.

    As for heat unless your growing in the loft witch then can be problematic concerning heat as the roof gets hot & if it snows your house sticks out as it will most lightly not have any snow that hasn’t melted ( unless you address that problem ) the lofts should be warm adding a single fan from a 400-600w light won’t change the loft heat much alought it’s something I did have to keep a eye on just in case when I did it.

    My biggest concern would be how well the insulation between the houses are.
    Last edited by Stillmix; 29-11-20 at 03:05 AM.

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    Pictures speak a thousand words
    Chimneys are usually not shared
    The arch in the loft is more than likely where two chimneys meet and travel through the roof. If the fires have been removed more than likely your chimney will be capped rendering it useless for your needs .
    Roofs/lofts are normally always vented at the eves .
    Best bet is to run your ductwork to the eves and create more ventilation at that point where the duct meets your eves . Then seal around the duct . So no air can travel back into your loft . The easiest way to check is to light a smoke pellet in your room with extraction on full and check the smoke is only leaving the loft at your selected exit and no smoke is sitting in the loft .


    from a green and pleasant land

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    I do hear wind through the fireplace in the living room I’ll get some pics of the walls in the loft. I do see some air bricks on the outside of the property but they don’t look high enough to be at the roof. I’ll have another inspection while it’s light outside to see if I can see anything coming in

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    Anyone upload pics straight from phones?

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    Quote Originally Posted by British green View Post
    Pictures speak a thousand words
    Chimneys are usually not shared
    The arch in the loft is more than likely where two chimneys meet and travel through the roof. If the fires have been removed more than likely your chimney will be capped rendering it useless for your needs .
    Roofs/lofts are normally always vented at the eves .
    Best bet is to run your ductwork to the eves and create more ventilation at that point where the duct meets your eves . Then seal around the duct . So no air can travel back into your loft . The easiest way to check is to light a smoke pellet in your room with extraction on full and check the smoke is only leaving the loft at your selected exit and no smoke is sitting in the loft .


    from a green and pleasant land
    I second that, I used to run two 600s and vent into the attic above my shop. It worked just fine during the summer but once the winter came it got too moist up there and grew mold even with attic vents at the Eve. I had to get a powered Eve vent and run my ductwork all the way up to that eve vent.



    J


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    Thanks jingo. Yeah it’s the winter months so I’m worried of venting straight up there as the temperature is very different on the outside so moisture and heat on the roof are going to be a problem for mould and flir.

    I’ve got some pics but not sure whether to upload straight from the phone or not

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    I'm saying run the duct to the eves and vent at the eves and not just straight into the attic/loft


    from a green and pleasant land

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    Quote Originally Posted by Marley13 View Post
    Thanks jingo. Yeah it’s the winter months so I’m worried of venting straight up there as the temperature is very different on the outside so moisture and heat on the roof are going to be a problem for mould and flir.

    I’ve got some pics but not sure whether to upload straight from the phone or not
    Just make sure you got your location data turned off on your phone before you upload your images.



    J


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