On 16 Mar, 19:10, Mr Green wrote:
On Thu, 15 Mar 2007 21:45:40 GMT, "Phil L"
wrote:



Mr Green wrote:
I am reseating a greenhouse on a concrete base - about 8ft x 6ft.

I will seat it on tanilized timber lats of say half inch x one and a
half inches - with rawl-bolts in the base - through the lats - and
then through the green-house base.

Why?

The base is not perfectly level - once side appears to be about half
an inch on the low side wrt the other three sides

I am minded to lay the wooden base lats on a mortar mix - just a skim
on three sides and then half-inch on the fourth.

Any points? - use a mortar mix or some other pre-prepared mastic or
similar - or even make as level as possible with mortar - let it go
off - and then lay all timber on mastic?

Why not let it go off, and then fix the greenhouse directly to it?

I intend to buy the tanilized timber lats - would you treat them any
more before use?

You are creating a problem which is unnecessary - the timber will rot -
especially if it's only half an inch thick, and within a few years it will
be gone, leaving gaps which the GH will slip into...simply use bolts or
screws direct into the concrete if you wish to fix it down, although it can
never blow away once glazed anyway.

I am following the instructions which say that you should put wood
between the greenhouse and the base; indeed, the greenhouse sills are
not flat - they need putting on a wooden support - they would not rest
level straight on the base.

I did not think that tanilized timber will rot in a couple of years-
that is why I was planning to use it I thought that it would last
about ten years - is this incorrect?

I would use the larger size of tile baton that the builders merchants
sell, and then keep it dry for a few days and give it a couple of
coats of a good wood preserver the last coat containing a water
repellent, then use a damp proof membrane between the concrete and the
timber.
Whilst the timber is tanalized, they are batch treated and the quality
of treatment is very variable so it is best to do it yourself.
I have bats' go off in less than 2 years whilst othere can last 6, 7
or even 8 yrs,

David Hill
Abacus Nurseries