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?
--
Shall we only threaten and be angry for an hour?
When the storm is ended shall we find
How softly but how swiftly they have sidled back to power
By the favour and contrivance of their kind?

From /Mesopotamia/ by Rudyard Kipling

On Sun, 09 Aug 2015 14:16:31 +0100, 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?

Screwing or bolting it to something heavy so it won't blow away in the
wind.

Some manufacturers supply an anchor kit, often concrete "kerb stones" with
captive nuts or studs and you then bolt the frame to them.

You can also mount the greenhouse on a run of treated timber which goes
under the sides and screw/coach bolt to this.

Basically, an aluminium greenhouse can move in a strong wind. Safest to
fix it to something heavy.

Plenty of Google examples, e.g.
http://www.gardenersworld.com/forum/...ng/greenhouse-
basesecuring-to-sleepers/78297.html

Cheers

Dave R

--
Windows 8.1 on PCSpecialist box

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.

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!

--

Jeff

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!

I know it's an aluminium greenhouse.
So are mine, I bought 2 8ft x 10ft which I joined to give me a 20ft x
8ft house. the house has a aluminium U shaped base plate and it's easier
to drill through the base and screw into the wood than to fix directly
to the concrete blocks.

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

On Sun, 09 Aug 2015 14:16:31 +0100, 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?

I live by the sea and experience regular gales.

After losing my last greenhouse to a storm, its 10 x 6 foot replacement is fixed thus:

It came with a separate 5-inch-tall base frame which is attached at the corners to
2-feet-long galvanised angle-irons concreted into the ground and protruding the necessary
5 inches. I've bolted the greenhouse to the base roughly every foot along the four sides,
which was about three times the frequency recommended in the construction manual.

At about six inches out from each corner, I hammered a 7-foot-long, 2-inch angle-iron into
the ground for about 30 inches. Galvanised wire was then threaded through three pairs of
holes in the angle irons and through the corner posts of the greenhouse.

To ensure the polycarbonate sheets don't vibrate out of their provided clips (which is
what happened with the previous one), I have bolted c.15-inch lengths of half-inch
angle-iron into the frame along the four sides of each sheet thus acting as clamps, while
further strips are bolted across the middle of the larger sheets.

In case this seems overkill, my greenhouse survived winds gustnig to 93 mph two winters
ago. My neighbours were not so fortunate.

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?

Thank you for all replies. I will bolt it to the 18 inch square paving
slabs. I assume that the greenhouse will have holes pre-drilled in it
and I shall use just as many bolts as there are holes.

--
Shall we only threaten and be angry for an hour?
When the storm is ended shall we find
How softly but how swiftly they have sidled back to power
By the favour and contrivance of their kind?

From /Mesopotamia/ by Rudyard Kipling

In article , david@abacus-
nurseries.co.uk says...

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.

At our previous place (exposed high moorland) J dug a 6" wide trench
same proportions as GH, poured and leveled concrete, then when set hard
drilled holes for expanding bolts. The GH was erected on the concrete
then bolted to it through the bottom edge of the frame. 100 mph winds
have never shifted it in 30 years.
Useful to lay a couple of sections of old pipe in the concrete as
conduits, in case later on you want to bring in power or water etc.

Janet.

On Mon, 10 Aug 2015 14:12:26 +0100, Justin Thyme wrote:

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?

Thank you for all replies. I will bolt it to the 18 inch square paving
slabs. I assume that the greenhouse will have holes pre-drilled in it
and I shall use just as many bolts as there are holes.

But if you wanr to be more secure, just drill some more holes and obtain some more bolts.

In article ,
says...

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?

Thank you for all replies. I will bolt it to the 18 inch square paving
slabs.

In a gale a GH is like a large sail; for which a paving slab is a very
lightweight anchor IMHO. You really need a rigid, foursquare solid base
to hold every right angle true under wind pressure.

If it distorts evn slightly, the glass panels are likely to either
crack or pop out.

Janet

David Hill wrote:

I know it's an aluminium greenhouse.
So are mine, I bought 2 8ft x 10ft which I joined to give me a 20ft x
8ft house. the house has a aluminium U shaped base plate and it's easier
to drill through the base and screw into the wood than to fix directly
to the concrete blocks.

A factor which hasn't been mentioned is that, relative to brick
or concrete, aluminium changes length significantly over the
temperature range it experiences, so anything introducing a
little flexibility is welcome.

It is a long time since I had a greenhouse, but I remember
mounting mine on a brick base and putting a neat mortar fillet
against the frame. After a few seasons it had all cracked off.

Chris
--
Chris J Dixon Nottingham UK


Plant amazing Acers.