concrete floor in greenhouse

  • 8 Replies
  • 4383 Views
*

tallulah

  • Hero Member
  • *****
  • Location: Suffolk
  • 1341
concrete floor in greenhouse
« on: December 23, 2011, 09:47 »
Hi all
I'd be very grateful for some advice. 

My greenhouse - 8x12' - has a concrete base.  I've been growing in pots, and have staging all down one side.  However, I really want to have soil borders a la polytunnel.  So, would it be feasible (regarding the stability of the frame) to pick-axe away a strip of concrete on each side so I can create soil beds.  Or, would I be able to build raised beds on top of the concrete, and if so, how high would these have to be, and would they need to be a kind of self-contained box?

*

JayG

  • Global Moderator
  • Hero Member
  • *****
  • Location: South West Sheffield
  • 16116
Re: concrete floor in greenhouse
« Reply #1 on: December 23, 2011, 11:02 »
I think it would be extremely difficult to remove the concrete to make borders without cracking the areas supporting the greenhouse - if it's very thin (3" is the least it's likely to be unless you've had the cowboys in!) you might be able to cut through it with a serious angle grinder which would obviously help (still a hell of a job though!)

You could built planters on top of the concrete - considerations are obviously the soil depth you can achieve without reducing the headroom you have left for your plants by too much, and drainage - any structure would need to include arrangements for excess water to drain away at or very near the bottom of it (depending on whether it is sitting on the concrete or slightly raised.)

My greenhouse has a concrete base and I'm pretty much resigned to using large pots and growbags (I actually used whole bags of MP compost laid flat this year because they provide a good depth and are easy to get rid of at the end of the season.)
Sow your seeds, plant your plants. What's the difference? A couple of weeks or more when answering possible queries!

One of the best things about being an orang-utan is the fact that you don't lose your good looks as you get older

*

savbo

  • Hero Member
  • *****
  • Location: Rusholme, Manchester
  • 1742
Re: concrete floor in greenhouse
« Reply #2 on: December 23, 2011, 11:04 »
second Jay's comments - the problem is knowing how deep your concrete is - even if it looks thin at the edges, it might get much deeper towards the middle, making breaking it out much harder ( as I found out on a project many years ago where a 1-day job became a 2-week one!)

and breaking it through while leaving a strip at the edge to support the frame will be very difficult - would probably need to try to cut through it?

So on balance I would go for a 1' deep raised bed...if you line the bottom of an open box with weed control fabric the soil won't wash out but water will be able to drain away

*

sunshineband

  • Global Moderator
  • Hero Member
  • *****
  • Location: Reading, Berkshire
  • 31999
  • Tallest Sunflower prizewinner 2014
    • A Little Bit of Sunshine
Re: concrete floor in greenhouse
« Reply #3 on: December 23, 2011, 12:20 »


I agree with the comments about removing the concrete -- not good!

Have you thought of drilling drainage holes through the concrete
 with a wide drill bit, and then putting weed membrane over the area before building raised beds?

This will not affect the height of ehat you can grow if you have already been growing in pots, and stop water washing along the floor of the house from under the beds.
Wisdom is knowing what to ignore - be comfortable in your own skin.
My Blog
My Diary
My Diary Comments

*

Axe

  • Experienced Member
  • ***
  • Location: Stanley County Durham
  • 124
Re: concrete floor in greenhouse
« Reply #4 on: December 23, 2011, 12:57 »
i would just stillsaw 2 tracks from the front to back then break them up aslong as you cut about 4-6 inches infront of the frames the concrete should hold perfectly fine.
« Last Edit: January 03, 2012, 00:41 by Axe »

*

Willie_Eckerslike

  • Guest
Re: concrete floor in greenhouse
« Reply #5 on: December 23, 2011, 15:31 »
If your greenhouse is already in place, then I would think that ANY work on the concrete is likely to shock the glazing and you could end up with a large bill to replace it.
Growing in containers means it is easy to replace the growing medium each year. Digging out the beds is a big job, as is importing fresh soil.

*

tallulah

  • Hero Member
  • *****
  • Location: Suffolk
  • 1341
Re: concrete floor in greenhouse
« Reply #6 on: December 23, 2011, 19:02 »
Great answers, thank you.  I think I'll try and sit some raised beds on top, with the weed membrane lining them.  Now I just need to work out a really simply design as I'm not that handy with wood.  I also have a really big hard paved terrace area at the back of the house that in my opinion is totally wasted and I want to put some tall raised beds on this as well, so I need to get a really easy diy design going!

*

Tom_Good

  • Newbie
  • *
  • 4
Re: concrete floor in greenhouse
« Reply #7 on: December 30, 2011, 23:38 »
You can cut the shape you want to knock out with an angle grinder and then sledgehammer the cut out for a fairly neat edge (depending on the depth) make sure its the right type of blade if you are going to use a grinder (assuming you have power there) and dont forget grinders and pavement cutters can kick like a mule and can kill quite quickly if they hit the right arteries.

Bolster chisel to define the edges (with goggles) if you have the time and arm power get a good one for a job like this it will save a lot of heartache.

*

tallulah

  • Hero Member
  • *****
  • Location: Suffolk
  • 1341
Re: concrete floor in greenhouse
« Reply #8 on: December 31, 2011, 17:48 »
You can cut the shape you want to knock out with an angle grinder and then sledgehammer the cut out for a fairly neat edge (depending on the depth) make sure its the right type of blade if you are going to use a grinder (assuming you have power there) and dont forget grinders and pavement cutters can kick like a mule and can kill quite quickly if they hit the right arteries.

Bolster chisel to define the edges (with goggles) if you have the time and arm power get a good one for a job like this it will save a lot of heartache.

Good Grief!  Even more reason just to stick some raised beds on top - much safer!



xx
New concrete floor

Started by Spana on Design and Construction

9 Replies
2898 Views
Last post February 26, 2010, 16:57
by new_2_veg
xx
Help needed to repair a concrete floor please

Started by Ice on Design and Construction

16 Replies
10690 Views
Last post April 01, 2011, 17:16
by smud6ie
xx
My Greenhouse Project - Concrete Base

Started by wil4025 on Design and Construction

13 Replies
8647 Views
Last post February 15, 2013, 22:27
by wil4025
xx
Greenhouse floor

Started by Elaine G on Design and Construction

11 Replies
2880 Views
Last post November 28, 2010, 22:13
by EddieJ
 

Page created in 0.069 seconds with 37 queries.

Powered by SMFPacks Social Login Mod
Powered by SMFPacks SEO Pro Mod |