Greenhouse Base FAQs - GardenSite.co.uk (2024)

What Is A Greenhouse Base?

Also known as a plinth or upstand, a base is the frame upon which a greenhouse is installed and, subsequently, will sit on top of once it has been assembled. Most bases are approximately 5 inches tall, raising the greenhouse’s overall height by around 12cm. You will need to secure your base to a suitable foundation or floor (it is important to note that the base and foundation are not the same) in order to ensure maximum stability.

What Is A Foundation or Floor?

A greenhouse foundation is the larger surface area upon which your greenhouse will be situated. We recommend either laying or using pre-existing concrete, paving slabs or decking for this. The most important factor, however, is to ensure that the foundation is 100% level and we strongly suggest using a spirit level to check this, otherwise, it can cause a multitude of problems!

Why Is It Important to Have a Solid Foundation/Floor?

  • To increase security: over the years, your greenhouse will be exposed to the harsh elements, including storms. You need to ensure that your base is suitably anchored to the foundation to maximise stability and avoid damage. In short, if you do not anchor your greenhouse down, it is likely to blow away.
  • To enable an easy and successful assembly: greenhouses and all their parts are made for level grounds. For example, the sliding door works on rollers which, if the foundation is not completely level, will catch, causing the door to become stiff and difficult to operate.
  • To avoid warping or stress: unevenness will likely lead to your glass panes or polycarbonate panels blowing out if the frame becomes distorted.

Can I Install My Greenhouse On Soil or Turf?

It is possible to install a greenhouse onto soil or turf, however, we strongly discourage this. The main negative is that soft ground is susceptible to subsidence which could cause warping or glass breakage. Other disadvantages include unwanted weed growth and water logging.

Do I Need a Greenhouse Base?

Yes - a base is absolutely essential with many models and should not be overlooked! Most people will buy the pre-fabricated base which can be found on the relevant greenhouse product pages, however, you can also build your own base from bricks or railway sleepers should you wish. Newer models on the market tend to have a built in base and often the added benefit of a low or even zero door threshold, we will detail this on the product page for the range you are looking at. For more information on building a suitable base, please clickhere.

What Are The Advantages of Having A Greenhouse Base?

  • It raises the overall height of the greenhouse by approximately 5 inches, creating more space and a more airy feel.
  • It allows the lipped edge of the frame to hang down without touching or dragging along the ground.

What If I Want To Plant In The Soil Under The Greenhouse?

You can excavate the ground around the perimeter of the greenhouse to create a strong foundation. Dig out a spade's width to a depth of 5-6ins around the edge. Fill the bottom 3-4ins with rubble, hardcore, stones etc. and crush it in. Either add 2-3ins of concrete mix on top or add a few smaller stones, firm down and top with 1 in sand, onto which you can lay slabs (maybe 18ins x 9ins). Alternatively, fill the whole hole with hardcore, crush in firmly and top with a sprinkling of sand to level it off. Slabs may be laid as a central path.

Can Anyone Install A Greenhouse?

Yes! Make sure you put the frame together loosely, then go around it progressively tightening up, as if you were tightening the nuts on a car wheel. Glaze the roof first (both sides) before starting the sides and ends. Use gloves!

Do GardenSite Install Greenhouses?

For greenhouse models which we are able to offer an installation service for, you'll find an option on the specific greenhouse product page which will guide you on the cost for installing that particular model with mainland UK.

How Do GardenSite Deliver Greenhouses?

GardenSite uses a specialist company that will telephone prior to arranging delivery. You cannot send glass by a standard parcel carrier and so the glass is pre-packed and then shrink wrapped into manageable packs and placed into a large wooden box. The frame and base are packed separately.

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Greenhouse Base FAQs - GardenSite.co.uk (2024)

FAQs

What is the best base to put a greenhouse on? ›

Concrete Pad

By far the most practical and durable foundation for any greenhouse is a solid concrete base. A good option for large greenhouses and can be set above ground level quite easily.

How deep should a greenhouse base be? ›

The trench is only dug where the walls are to be built and is typically twice the width of the wall required. The plinth walls are then built on top of the resulting concrete “strip”. On stable and level ground the foundations should be at a minimum depth of 450mm (18”) below ground level.

How to seal a greenhouse base to concrete slabs? ›

To anchor your greenhouse down onto slabs, concrete or brick you will need a hammer drill and we rec- ommend that you use 7mm brown rawl plugs with 2” no 10 wood screws. (available from us if you like — concrete anchoring set, £5 pack of 10).

What should you not put in a greenhouse? ›

What not to grow in a greenhouse
  • Giant Trees and Shrubs: ...
  • Invasive Species: ...
  • Aggressive Vines: ...
  • Water-Hungry Crops in Excess: ...
  • Plants with Extreme Temperature Requirements: ...
  • Highly Sensitive Varieties: ...
  • Crops with Pests and Diseases: ...
  • Plants with Excessive Maintenance Needs:
Nov 14, 2023

What to put in the bottom of a greenhouse? ›

A concrete slab base is the most durable foundation for a greenhouse.

What should be on the floor of a greenhouse? ›

Landscape rock is a good choice for greenhouse flooring because it is durable and easy to clean. It also provides good insulation. However, landscape rock can be expensive to install and it requires regular maintenance to keep it looking its best.

Can a greenhouse sit on gravel? ›

🌱 Gravel or Crushed Stone: Consider using gravel or crushed stone as a cost-effective base for your greenhouse. This material provides good drainage and stability. Level the area and lay a thick layer of gravel or crushed stone to create a firm foundation.

How to anchor a greenhouse base? ›

All you have to do is fix the base of the greenhouse to the ground using anchor bolts or fixing plugs with a diameter of at least 8 mm. Quick tip: if your greenhouse does not have any anchor points for hard ground, get yourself some galvanised bolt-down post supports which should ideally feature a fixing plate.

Does a greenhouse base need to be level? ›

We recommend either laying or using pre-existing concrete, paving slabs or decking for this. The most important factor, however, is to ensure that the foundation is 100% level and we strongly suggest using a spirit level to check this, otherwise, it can cause a multitude of problems!

Should I put plastic under my concrete slab? ›

The short answer is no, vapor barrier plastic underneath concrete slabs is required by ASTM compliance standards for many reasons. Vapor barriers protect not only the building project itself but the people inside.

How do you prepare the ground for a greenhouse? ›

It's also generally easier to build on even ground. Once the greenhouse site is level, lay down a well-draining material that blocks weeds from growing in your greenhouse. You can use gravel, landscape fabric, or bricks. You can even lay down gravel on top of landscape fabric for a double layer of weed protection.

How thick should a concrete slab be for a greenhouse? ›

A sLAb is another common type of shallow foundation common with greenhouse structures. The slab will be about 4–6 inches in thickness, except at the perimeter where it will be thickened. All concrete foundations should include the use of rebar to strengthen the concrete as well as steel mesh in the slab options.

What are the bad things about greenhouses? ›

As structures, greenhouses are not typically biodegradable because they are often made of materials like glass, plastic, aluminium, or steel, which are not biodegradable. Plastics, a common component of modern greenhouses, pose a significant environmental threat.

Should a greenhouse be closed at night? ›

For effective ventilation:

Open all doors and vents on sunny days. These can be left open at night if the temperature remains high. It is sometimes necessary to temporarily remove panes from glasshouses to assist ventilation in heat waves. Fit automatic vent openers to ensure roof vents open even when you are not ...

What is a good foundation for a greenhouse? ›

A concrete foundation is the most durable option and if properly sealed, will protect you from the elements for years. And as you can guess, the heavier the greenhouse, the more important it is to build a strong base to support it.

Can you put a greenhouse straight on the ground? ›

You can site your greenhouse directly onto soil or onto a hardstanding. Not all greenhouses will have both options available so take care when looking at specifications.

Is gravel a good base for a greenhouse? ›

🌱 Gravel or Crushed Stone: Consider using gravel or crushed stone as a cost-effective base for your greenhouse. This material provides good drainage and stability. Level the area and lay a thick layer of gravel or crushed stone to create a firm foundation.

Should a greenhouse be in the sun or shade? ›

Ideally, greenhouses should be sited where they can receive uninterrupted sun throughout the day. Provide screening or shelter from cold northerly or easterly winds, which can keep temperatures low in spring and slow the growth of seedlings and young plants.

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