This is how we created our recently finished hardwood garden deck with greenhouse. We love using the house in the chilly evenings and when it rains. The deck is obviously great when the weather is good, and with trees providing nice shade.
Step 1: Preparation
Clearing bushes, removing an old shed with it's foundation, and levelling the ground. We left as many of the trees and bushes as we could, so we did not have to wait many years for everything to grow in.
In the pictures you can see four temporary wooden beams, that were levelled and had the height of the final deck and support beams. This way it was easy to see how much earth that had to be removed, as it is essential that the final beams are not in direct contact with the earth, which would cause them to quickly rot.
Step 2: Concrete Footings
The beam shoes were bolted onto an inflexible fiberboard, and stuck into concrete four at a time. It can be seen seen supported in the front of the picture, by some temporary garden fence rods. The height does not have to be super precise, as the beams can be adjusted in the shoes later.
Holes for the concrete were drilled with a ø10cm hand earth auger, to a depth of approximately 60cm. Shoes were placed 130cm apart.
Step 3: Support Beams
Support beams for deck. I started out by carefully levelling out every third or fourth beam, and then placed a long aluminium profile across, to get the height for the beams in between.Beams were placed 60cm apart, but this will depend on the wood and thickness of the planks.
Step 4: Greenhouse Foundation
The greenhouse has it's own point foundation in every corner. This means that the greenhouse is not attached to the deck, except for a silicone seal. My dog demonstrates how the foundation (and electricity) is passed through the deck. I did not know how much the boards would move with the seasons, or how a storm would affect the house, hence this slightly complicated solution, instead of just bolting the house to the deck.
The foundation for the house was stronger than for the deck, and with reinforcement so that it can withstand a storm. Consult and follow the manual of your greenhouse.
There is 5mm gap between the foundation and the deck, to allow for the
deck to move underneath the house. Outdoor wires for electricity was drawn to two corners of the house, and attached to the side of the beams,
Step 5: Laying the Deck
The deck was mounted with a 5mm gap. The supplier of the boards recommended 7mm, and I guess they were right :) The boards change a lot with humidity, and they were dry when I layed them out.
In the part of the deck that was inside the house, I placed an self adhesive rubber seal in the gaps, to reduce draft and bugs coming up from the underside.
It is important to use stainless steel screws certified for the type of hardwood you are going to use, otherwise they will discolor the wood. And remember that stainless screws are very soft, so you only get one chance putting them in.
I used some clamps where it was possible to replace the jaws with a deck jaw (see the image in BOM). This allowed for pulling and pushing the planks into place. I would recommend getting the biggest you can, as hardwood require some force to be kept in place.
There is a screw in the middle of both ends of the beams, between which the yellow string is attached, so that all screws could be aligned properly.
Step 6: Assembling the Greenhouse
Assembling the greenhouse was just to follow a very complicated instruction manual!
As we mounted the glass, we added postit's to the panes to avoid walking into them :)
It is important to get a greenhouse with tempered glass, if you are going to stay inside for longer periods of time, or if kid's might play in there. You don't want large shards of glass falling form the ceiling when hit by a ball or bird.
We replaced the top of the desk with a stone plate, as a wooden top would probably not last long with the changing humidity and temperature.
Step 7: Early Testrun
Checking for leaks during a rainfall, and trying out the newly assembled garden furniture.
An infrared heater is placed in the ceiling, for the evenings when the temperature drops, or the wind cools the house.
Step 8: Adding a Few Steps
I wanted to use the same wood for the steps as the deck, so I screwed and glued two pieces together to make it strong enough, I used a cardboard template to get the angles and height right.
The white cardboard template can be seen where the side of the steps were bolted onto the support beam.
Step 9: Stone Edges
In some places, the deck is at level with the ground. So some concrete patio stones were placed upright in a bit of cement, to shield the boards from the wet earth.
Some screws were inserted into the beams, to keep the stones from touching the wood, as this would cause the wood to rot. (they can just be made out in the space between the deck and the stone )
Step 10: A Bit More Shelter
After the deck was done, I added another section to our fence, to give us a bit more privacy.
How I create the fence out of patio cement stones, I will document in another instructable.
Step 11: Bill of Materials and Tools
Here are the main components you will need to make your own deck, and the amounts I used:
Hardwood planks: 55 m2 (22x145mm)
Screws: 1000x Stainless steel 5.5x60mm (approved for hardwood)
Beams: 80m (40x80mm) @ every 60cm
Foundation shoes: 76
Greenhouse with tempered glass. (Sirius 13000)
Four large clamps with add on for deck (see image)
Drill for sinking in the screws (see image)
Template for marking holes for screws (I 3d printed one)
Hand earth auger Ø10-15cm
Cement mixer or a big bucket
Measuring tape >15m
Step 12: A Few More Pictures
Thank you for reading our instructable.
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