Need a bit of help with the math on this one if anyone would be so kind. maths is not a strong point with me

I need to know the suface area of the inside of my growbox in meters squared. The dimensions are as follows...

Click to view attachment

ill make it even easier for ya i may be getting thermal foil that comes in 7.5m x 600mm rolls which makes 4.5m2 a roll - How amny rolls does that make?

thanks alot
Roach

1.68m2

1.25 x 1.35 = 1.68m2

inches: inches x inches divide by 1550 = m2
Feet: ft x ft divide by 11 = m2

It cant be the whole surface area - i think you missed out the walls and roof but if was wrong it wouldnt suprise me
that would mean i would only need one roll of foil at 4.5 M2 a roll?

that was floor space only

do the maths you lazy bastard

Mate i wish i could but i really cant im afraid thanks though

PS
Im not lazy...... just a bit thick

13.01m2 roughly

i would allow for over lapping joints for better insulation and seal, so reduce the width to about 550mm.Goodluck with the calculations 2 rolls as a guestimate

Thanks Darkside so ill make that 15 M2 and i should be laughing thanks again


EDIT - you just made my night mate 18 m2 for 4 rolls at 2 for 1 which makes it £40 that means ill be able to double it up in places


Sorry mate just to clarify.. thats including the roof panels? cheers fella

Cheeky bump

1.85 X 1.35 = 2.4975 (2.5)
0.8 x 1.35 = 1.08 (1.1)
0.9 x 1.35 = 1.215 (1.3)
1.7 x 1.35 = 2.295 (2.3)
1.7 x 1.35 = 2.295 (2.3)
1.25 x 1.35 = 1.6875 (1.7)

and then areas at the top with 4 sides

add the rounded numbers then add 2 extra meter square for the top bits

= 11 m2

so 3 rolls (thats for all the walls + floor surface area, i might be wrong im pretty high)

EDIT: correction

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[/quote]
is that diagram by Escher?

2 maybe 3 rolls for all walls, you dont really need to do the roof as well, your lamp is gonna be shining most of the light down so why waste foil+light
i only have my foil about 10" above the highest lamp position, waste of time imo although i do take my mylar down to the floor
just the way i do it

i think hes also thinking insulation is paramount due to him buying the duralay stuff ? so only having it so high would be fine for reflection, but not for insulation so maybe thats why hes covering everything ? i could be wrong.

missed that bit
3/4 rolls then

Nice one chaps 4 rolls for £40 will do me nicely