On 10/08/2015 11:37, Jeff Layman wrote:
On 10/08/15 10:12, David Hill wrote:
On 09/08/2015 14:16, Justin Thyme wrote:
I am thinking of buying one of thee:
http://www.greenhousesdirect.co.uk/G...est%206ft/6x6/
and erecting it myself. It will be placed on concrete paving slabs. The
manufacturer write of anchoring down the greenhouse, what does that
entail exactly?


What I did was to take out a shallow trench, then put down 2 to 3 inches
of concrete and set a row of concrete blocks to form the base, the
blocks were set onto the wet concrete and had wooden wedges set into
every 2nd joint (narrow end up)
When the blocks are set a 4x1 inch plank was nailed to the wedges; with
a damp proof membrane between the blocks and the wood; and a few masonry
nails used as well.
then when assembled the base of the greenhouse was screwed to the wooden
plank with screws every 18 inches.
This does mean you have a step into the greenhouse but it also means
that you have an extra 9 inches of headroom.

The OP referred to an aluminium greenhouse, rather than wood.

Out of interest, what purpose do the wedges and plank serve? Why not
have a damp-proof membrane over the concrete blocks, and just screw the
greenhouse to the concrete blocks direct?

FWIW, the 14 x 8 ali greenhouse I have was erected nearly three years
ago. The base was hardcore, concrete, then a double layer of bricks over
that. The greenhouse base was screwed onto the bricks, and the frame
fixed to the base.

In case the OP is thinking that all the posts mentioning a strongly
fixed frame is essential are a bit OTT, the forces on a greenhouse
during a gale can be extraordinary. Mine had a toughened glass roof pane
(5 x 2) sucked out by a gale and deposited 20 feet away!


this is how the side looks
http://i240.photobucket.com/albums/f...ps188737f4.jpg