Most common mistakes during the installation of raised deck terraces

This is the most common and most critical mistake.

If the base:

• is not compacted
• contains loose layers
• does not have adequate load-bearing capacity

the pedestals can sink, and the entire structure loses stability.

Effects:

• "clicking" of pavers
• unevenness
• formation of puddles
• sinking of the terrace
• structural instability

How to avoid:

• prepare a stable base (ground or screed)
• use blocks / slabs under the pedestals
• control the hardness of the base

In a raised deck terrace system, the slope must be created in the substrate, and at the level of the usable surface—pavers or boards.

Mistake:

• lack of slope
• slope in the wrong direction (not towards the drain)
• uneven substrate

Effects:

• water pooling
• overloading of the waterproofing membrane
• accelerated system degradation

How to avoid:

• use a slope of 1.5–2%
• direct water towards drains
• check the slope before installation

→ See also: What slope should a terrace have for water to drain off? What percentage of slope is recommended for a terrace?

Too sparse spacing is one of the most common installation errors.

Error:

• too large distances between pedestals
• lack of support at paver corners
• lack of additional supports under loads

Effects:

• sagging of pavers and boards (deformations)
• cracking of pavers
• instability of the surface

How to avoid this:

• match the spacing to the paver format
• use additional pedestals under loads
• check the manufacturer's recommendations

See also: Loads and load-bearing capacity of a raised deck terrace - what is worth knowing?

Laying pavers "edge to edge", without space for the material to work under the influence of weather conditions.

Effects:

• no water drainage
• no expansion compensation
• edge damage

How to avoid:

• use 3 or 5 mm spacers between pavers
• use up to wall clips at walls or other vertical structural elements

Gap or joint on an external terrace - how to choose the right width?

Directly placing pedestals on delicate waterproofing can lead to its damage. Although pedestals do not have sharp edges, it is worth additionally protecting the waterproofing

Mistake:

• lack of protective pads on delicate waterproofing
• point loads
• friction of components

Effects:

• damage to the insulation
• leaks
• costly repairs

How to avoid:

• use SBR rubber pads
• distribute loads evenly

See also: Drainage of a raised deck terrace - how does it work and how to do it correctly?

The most common problems and questions arise in "atypical" places.

Mistake:

• lack of pedestal adjustment
• improper paver cuts
• blocking the drain

Effects:

• drainage problems
• instability
• aesthetic shortcomings

How to avoid:

• plan details in advance
• use dedicated accessories

See also: Accessories for raised deck terraces – system elements that determine durability

Most problems with raised deck terraces do not result from the system itself, but from installation errors.

The most important rules:

• stable substrate
• proper slope
• correct pedestal spacing
• maintaining expansion gaps
• waterproofing protection

If these elements are met, the terrace will be durable for years.