Uncategorized • 18 Mayta, 2023

Building a Terrace – Guidelines for a Successful Outcome

When the spring sun shines, it’s tempting to turn your attention to the outdoor area of your home. A terrace is a great addition to your backyard, offering a pleasant outdoor space for relaxation and enjoyment.

Building a terrace is not overly difficult, and with careful planning and quality materials, you can create a beautiful and durable structure. With a well-drafted plan, the actual construction of the terrace can be completed in a couple of weekends!

A well-designed terrace is halfway done

A neat and high-quality terrace not only serves the residents’ needs for a long time but also increases the value of the property. That’s why it’s worth investing time and effort into the planning phase. With a good and well-thought-out plan, it’s easy to start building a terrace that suits your specific needs!

Start the planning process by considering the intended use of the terrace. What activities do you want to enjoy on the terrace? Will it serve as a pathway or accommodate specific furniture? Do you need open space for hobbies or activities? Are you planning to include a grill area or maybe even a hot tub?

Once you have determined the intended use, think about where the terrace should be located to best serve the residents. Do you want to enjoy morning coffee on a sunlit terrace, or do you prefer to relax in the evening sun?

Next, consider the size of the terrace. It’s important to make it sufficiently spacious from the beginning. A terrace that is too small can quickly become impractical and fail to meet your needs. When determining the size, make sure to leave enough space around furniture and ensure easy movement on the terrace.

Once you have clarified the purpose, location, and size, check local building regulations and determine whether you need a permit for constructing the terrace. Also, find out if you require stairs or railings for the terrace. Generally, a railing is necessary when the drop height exceeds 500 mm or when there is a risk of falling or stepping off the edge.

By following these guidelines and ensuring careful planning, you can successfully build a terrace that enhances your outdoor living space. Enjoy the process and the end result of your beautifully constructed terrace!

terassilauta kuusi

Design the intended use, location, and size of the terrace carefully.

The groundwork is done according to the soil conditions

The groundwork for the terrace depends on the underlying soil. The soil in the yard may consist of non-frosting sand or gravel, or it may be clay soil that freezes during winter. Sandy soil usually has good water permeability, while clay soil does not absorb water well and tends to freeze. If you are unsure about the need for groundwork and the appropriate foundation method, seek assistance from a professional. It is important to do the groundwork carefully, as making corrections afterward can be more challenging.

A non-frosting gravel or sand base often provides the easiest foundation for the terrace, requiring minimal groundwork. In such soil conditions, extensive groundwork is usually not necessary, and simply removing the topsoil and leveling the area is sufficient. In these cases, the terrace foundation can often be built directly on top of concrete tiles placed on the well-leveled ground.

terassin perustus

With non-frosting sandy soil, the groundwork is relatively easy.

Clayey soil that experiences frost requires more attention and work. This type of soil needs to be protected against frost to prevent the foundation from moving. In the case of frost-prone soil like clay, the frost insulation involves excavating the frost-susceptible soil, such as clay, and replacing it with gravel or crushed stone. Another suitable option for frost-prone soil is a helical pile foundation, which eliminates the need for separate frost insulation as the helical pile is screwed below the frost line.

If the terrain is sloping, it may be necessary to pour pillars to ensure a level and safe terrace. In such cases, it is also important to consider the need for a railing.

Regardless of the type of soil, for a neat end result, it is recommended to remove the topsoil across the entire area of the terrace. The soil beneath the terrace should be leveled to allow rainwater to drain away from any nearby buildings. Place a geotextile fabric over the excavated area and then add a layer of water-permeable material such as crushed stone or gravel. The fabric prevents weeds from growing under the terrace, and the layer of material prevents the formation of puddles from rainwater.

When building on rocky ground, there is no need to worry about soil frost or removing topsoil. However, constructing a level terrace on rocky ground requires more expertise. The foundation of the terrace can be attached directly to the rock using drilled brackets, for example. Remember to choose stainless steel fasteners, as replacing them later can be a laborious task. If the rock surface is even, the frame can also be supported by adjustable terrace legs.

Do not skimp on the foundations

It is important to carry out the groundwork and foundations of the terrace carefully. Proper and well-executed foundations ensure a long-lasting and safe terrace.

There are several different methods for constructing terrace foundations, and as discussed earlier, the quality of the soil has a significant impact on the choice of foundation. In this blog post, we will present three suitable foundation methods for a terrace:

1. Lightweight foundation on top of concrete slabs

A simple lightweight foundation is suitable for non-frosting sandy or gravelly soil. Start by removing any topsoil and leveling the ground. Place a geotextile fabric and spread a layer of crushed stone on top.

Next, measure the spots for the concrete slabs and position them accordingly. Use a laser or level to ensure that the slabs are at the same height. Choosing larger slabs will provide better stability.

Once the slabs are in place, you can proceed with constructing the frame of the terrace. It is advisable to place a piece of roofing felt between the frame board and the slab to prevent moisture from rising into the frame boards.

terassin rakentaminen

A lightweight foundation using concrete tiles is sufficient for non-freezing ground. Measure the tiles to the same height using a spirit level and a piece of board.

2. Block foundation

A block foundation is constructed using concrete blocks. If the ground is prone to freezing, create frost insulation by digging a hole approximately 60-80 cm deep and 50 cm in diameter. The hole should extend below the frost line. Fill the hole with gravel and level the surface carefully. Optionally, you can place a piece of geotextile at the bottom to prevent soil from mixing with the gravel.

Even if you don’t create frost insulation, it is recommended to remove the top layer of soil, place geotextile at the bottom, and add gravel or crushed stone. Place a concrete tile on the gravel surface and stack the necessary number of concrete blocks on top of it. Fill the central part of the blocks with ready-mix concrete and insert cut pieces of reinforcement steel into the fresh concrete.

3. Screw pile foundation

Screw piles are a convenient way to create foundations and can be used on sandy or moderately frost-prone ground, provided that the soil is not very rocky.

Install the screw piles into the ground, rotating them clockwise and below the frost line. Use a lever arm such as an iron bar for support. Attach the chosen bracket for the main beams to the end of the screw pile.

Ensure the load-bearing capacity of the pile before installation. It is also important to check that there are no drainage or power lines running through the installation area before screwing the pile into the ground.

There are many different options for terrace foundations. Take the time to carefully explore the various alternatives and consult a professional if needed to choose the appropriate foundation method.

A sturdy frame ensures that the terrace can withstand even larger Midsummer festivities.

komposiitti terassilauta ja palju

The recommended joist spacing for composite decking boards is 400 mm.

The frame of the deck is constructed using main beams and joists. There are different sizes available for the main beams, and the size is determined by the size of the deck, desired height, and the chosen decking board. A larger main beam provides more stability. For the main beams, it is recommended to choose the strongest material, and for the joists, slightly smaller dimensional lumber can be used, although it is also possible to use the same size for both.

The spacing between the joists typically ranges from 400 to 700 mm. The appropriate joist spacing is determined by the material and dimensions of the decking boards. For example, a common joist spacing for traditional 28 mm thick pressure-treated wood decking boards is 600 mm. On the other hand, composite decking boards require a closer joist spacing, and the recommended joist spacing for composite decking is 400 mm.

The construction of the frame starts with the outer perimeter beams, or main beams. Place the outer beams in position and screw them together. It is recommended to use only stainless steel or corrosion-resistant steel screws and fasteners for the frame. Make sure to check the diagonal measurement of the deck. Measure the locations for the joists and screw the joist hangers onto the outer main beams. Place the joists into the joist hangers and secure them with screws. The deck frame is now ready! The next step is to proceed with the decking installation.

terassin rungon rakentaminen

Valitse terassiin tukevat runkolankut.

High-quality decking lasts and looks great.

There are many options for high-quality decking materials. When choosing the decking material, it’s important to consider your own needs, requirements, and budget. It’s also worth considering how much time and effort you’re willing to invest in maintaining or finishing the deck.

Traditional pressure-treated wood boards are more affordable options and, when properly maintained, can withstand weather conditions well. AB-grade Letto decking boards are stylish and durable pressure-treated boards suitable for all deck projects. Another option for pressure-treated wood is Pauha decking boards made from domestic spruce. This domestic product is completely non-toxic and a safe choice. If you’re looking for a completely maintenance-free, highly durable, and long-lasting deck, composite wood is the best choice. If you’re still unsure about the decking material selection, you can consult our decking material selection guide.

harmaa komposiitti terassilauta

Kompostiittilauta Ulkokalla on tyylikäs, ajaton ja täysin huoltovapaa terassilauta.

It is important to know the size of the deck before purchasing decking boards. The neatest result is achieved when the board is the full length of the deck. This makes the work progress smoothly and easily without the need for joints in the deck. Fortunately, decking boards are available in various sizes, so you can choose the most suitable option for your deck.

Before starting the installation of the decking boards, double-check the diagonal measurement of the frame. If the diagonal measurement is correct, you can begin the decking installation. Start installing the boards from the front edge of the deck. Leave approximately a 5mm gap between the boards, and a useful tool for this is a carpenter’s pencil. If the wood is moist, use a smaller gap, as the wood will shrink as it dries. Screw the boards in place using stainless steel deck screws that can withstand weather changes well. To ensure a neat result, make sure that the screws are aligned with each other.

For the installation of composite boards, hidden fasteners are used, which are placed between each board. Multiple fasteners are used between the boards, making it easy to maintain an even gap between them. Make sure to install the board all the way down to the base of the fastener. At regular intervals, use a measuring tool to ensure that the line of the boards stays straight.

terassin piilokiinnike

Composite boards are attached using hidden fasteners that go between the boards.

A finished deck is a delight to the eye.

Complete your deck with the appropriate treatment. Pressure-treated lumber may lose its color over time due to sunlight and moisture. With the right maintenance, the product can stay in good condition and beautiful for a long time. Pressure-treated deck boards can be treated with tinted or untinted wood oil, wood preservative, or exterior-grade paint. Pauha deck boards are pre-treated with a gray-colored, water-based Teknoshield 4015-00 wood oil. To achieve the best durability, the treatment should be reapplied annually. It is recommended to treat the cut ends of deck boards with a protective wood oil during installation. Composite deck boards are maintenance-free and do not require any treatment. Cleaning with water or brushing is sufficient.

harmaa ekologinen pauha terassilauta

The domestic Pauha deck board is a completely non-toxic decking material.

During the construction phase, it is difficult to avoid waste materials completely. Depending on the material, the disposal of waste pieces should be done accordingly. Treated wood, such as pressure-treated lumber, is considered hazardous waste and should be taken to a designated waste collection facility. CENT wood-composite boards are non-toxic and can be sorted as combustible mixed waste, burned, or recycled as energy waste. Similarly, Pauha deck boards are completely non-toxic, and waste pieces can be disposed of by burning.

Now that you know everything you need for successful deck construction, it’s time to start! Remember that building a deck is a fun and rewarding task. A high-quality deck significantly improves the comfort of your home and increases the value of your property. So don’t hesitate to take action and create your dream summer oasis. Best of luck and success in building your deck!

terassi ja kesämökki

A high-quality deck significantly enhances the comfort of your home.

Building a deck in a nutshell:
1. Carefully plan the design and location of your deck.
2. Prepare the site by performing the necessary groundwork.
3. Construct the deck’s foundation.
4. Build the deck frame.
5. Install the deck boards.
6. Finish the deck.
7. Dispose of waste materials according to their specific requirements.

For detailed instructions on installing a composite deck, you can refer to the video guide: [Link: https://www.youtube.com/watch?v=hJ1JD0D3uQI]


CENT on yksi Suomen laadukkaimmista kodin viimeistelytuotteiden valmistajista. Missiomme on sekä valmistaa että toimittaa tuotteemme luontoa kunnioittaen, ensiluokkaisella palvelulla ja luotettavasti. Kotimaan markkinoiden lisäksi CENT valmistaa tuotteita myös vientiin.