Step by Step Installation Manual for a Patio Door

Over time, the looks of front, patio or balcony doors can suffer from permanent weather exposure. In addition, older models may also fail to meet modern functional requirements for burglary protection or thermal and sound insulation. In such cases, installing new doors may be in order. However, the installation of a new door does not necessarily require the help of professionals. This manual explains all of the important steps for installing a balcony or patio door in detail. Even inexperienced do-it-yourself enthusiasts will have no problems with the installation. For a professional patio door installation, you will need the appropriate tools and materials.


  • New patio door
  • Screws
  • Washers
  • Vapour resistant foil
  • Vapour diffusive foil
  • trioplex tape (if available)
  • Construction foam
  • Construction foam cleaner
  • Blueprints
  • Pen


  • Bubble level
  • Electric screwdriver
  • Impact or percussion drill
  • Wood or stone drill (6 mm)
  • Measuring tape
  • Construction foam gun
  • Slotted (‘flat-head’) screwdrivers

1. Preparations

In order to perform the installation of a patio door smoothly, all the necessary tools and materials should be placed within reach beforehand, so they can be used without delay during the procedure. If the old patio door is still installed, it will need to be removed first. As soon as the old patio door is removed correctly, the installation of the new one may begin. It should ideally be installed according to contemporary high-quality installation standards such as the German RAL standard. In order to do this, several steps have to be performed beforehand.

Clean the patio door reveal, making sure that no dust or dirt particles remain. Ideal thermal insulation values can only be achieved if the new patio door is installed onto clean surfaces. Clean surface conditions allow the sealing material to fully adhere to the reveal, allowing for a fault-free installation procedure.

Re-measure the reveal before installation. This way, you can be assured that the measurements of the new patio door actually match those of the reveal. If building blueprints are available, you should also put down the measured figures in writing, marked with their respective date.

Always focus on personal safety during installation. In order to minimize the risk of injury during the installation of a heavy and unwieldy patio door, adding an additional helper should always be considered. Furthermore, you should always use solid shoes, wear the appropriate work gloves and protect your eyes with safety goggles while drilling.

2. Preparing the Patio Door

In order to avoid transport damage, special transport protection foils are applied to patio doors and windows. Remove this foil from the wall-facing parts of the patio door frame before installation, as removing the foil afterwards may prove to be very difficult. All other parts of the foil should only be removed after the installation.

Install the handle at the respective position of the door and open its casement.

Lift the casement out of the frame. In order to do this, the upper security pin can be removed in a downward motion using a slotted screwdriver, allowing for the casement to be lifted upwards out of its hinges.

Place the unhinged casement on soft padding material. Massive aluminium patio doors can easily damage wooden floors during installation, while the surfaces of wooden, aluminium and uPVC casements may also be negatively affected themselves.

When all preparations are done, the installation of your patio door can begin. The average installation time for a patio door is about two to three hours.

3. Choosing a Seal

If you want to save energy costs with the installation of a new balcony or patio door, choosing the right type of sealing material is very important. There are three different sealing levels:

a) Inner Seal Level

The inner sealing level separates the inside from the outside climate. The seal has to be vapour diffusion resistant, ensuring reliable climate separation and stopping the diffusion of water vapour through the door. Usually, you can use vapour resistant foil or acrylic jointing for installation.

b) Middle Seal Level

The main space between masonry and the patio door frame is called the middle sealing level. To provide good thermal insulation, it is essential to completely fill these gaps with insulating materials. Most common is the use of polyurethane construction foam. Other filling material, such as cotton fibre and mineral fibre materials, are alternative solutions. People suffering from allergies may want to be careful in their choice of insulating material, as polyurethane may cause allergic reactions. The use of other filling materials is more sensible in such cases.

c) Outer Seal Level

The outer sealing level provides the profile of the new patio door with long-term protection from weather influences. In accordance to ISO standards, the installation must be heavy rain proof and open to vapour diffusion simultaneously. Foils and pre-compressed sealing tapes can meet these requirements quite easily. Sealing the joints with silicon is also possible.

Proper seals not only ensure good thermal insulation, they also protect the actual masonry from atmospheric influences in the long term. Once you have chosen the appropriate sealing materials for the different levels, you can easily order them in the accessories shop.

4. Installation and Adjustment of the Frame

The next step consists of frame installation and adjustment, using a bubble level and washers for the alignment.

Mount the seals onto the frame.

Insert the frame into the wall opening.

The frame must be attached and adjusted correctly. Adjust it with the supplied washers and check the result with the bubble level. Doors can only close and insulate correctly when the frame is perfectly balanced.

5. Screwing-in the Frame

To ensure structural stability and functionality, the new door must be screwed-in tight to the masonry.

First, drill the necessary mounting holes into the masonry with an impact drill. The selection of the appropriate drill depends on the condition of the masonry. Please be especially careful with old buildings, in order to avoid damages to the structure during installation.

Check the adjustment of the patio door again after the drilling of the mounting holes.

The screws can now be used to screw-in the frame. Use a cordless electric screwdriver for this step.

6. Foaming and Sealing the Gaps

Once the patio door is affixed to the masonry, the open gaps need to be foamed with appropriate insulating material. If you want to use foil for the inside sealing and sealing tape for the outside, the tape will have to fully expand before you can begin the foaming procedure.

Completely foam the gaps between masonry and patio door or fill them with respective materials. As the foam will expand once applied, it should be dosed very carefully. Wait a little while and add more foam if necessary.

Completely attach the chosen foil for the inner sealing level to the masonry or alternatively fill the joints with acrylic.

7. Installation and Adjustment of the Casement

The installation of the door frame is almost now complete and the different seals are attached. The final step of the procedure is inserting and adjusting the casement.

Attach the casement to the hinges. Once this is done, you should check the opening and closing mechanism of the leaf a few times.

If the patio door jams or squeaks, it has to be re-adjusted.

There is not necessarily a need for professional window fitters for the installation of new doors. The information in this manual can help anyone to install patio doors and windows step by step. However, the manual not only teaches you about the installation of new patio doors – it also allows you to save money by doing the work yourself. The installation of windows and balcony doors also shouldn’t be a problem for you, as these procedures are very similar.

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