Complete Roofing DIY Step By Step

A roof can be covered in many ways and with many different materials do-it-yourself. This page provides insight into which approach is suitable for which roof. Of course, roofing must not only be functional, but also attractive. Here you will find all information step by step regarding roofing, repair and insulation.

What types of roofing should I use? A single-layer roofing can be used to cover storage areas, garages and the like. A multi-layer roofing is necessary for rooms that are inhabited.

Preparation

Control and pre-treatment

Before covering the roof, it must be checked whether the roof is in order. It should be clean and dry. Remove old or protruding nails on a wooden surface. Warped planks need to be planed. Bad or rotten boards must be removed.

If finishing with a top layer, the bottom layer and the wood must be separated by Roofing newsprint. This is to prevent cracks in the bottom layer due to the effect of the wood. A concrete layer must be completely flat before covering. In addition, it must be pre-treated with a primer. You apply this quick-drying layer with the help of a brush, paint roller, lazy car or puller.
After drying (± 90 minutes) you apply the undercoat. In addition to the above, it is important to know that a flat roof should never be completely horizontal.

After all, the rainwater would then remain on the roof. The roof must therefore be able to drain and for that you have to make a slope of 1 centimeter per meter towards the rainwater drainage. If the drain becomes clogged, it is important to make provision for the water to drain over the edge.

Freestanding eaves

The edges of a roof floor must be finished with a fascia. You can make these from waterproof meranti or solid plastic plates. You apply the fascia boards vertically and let them protrude 10 cm above the roof floor or insulation. You fix the fascia by nailing it to the edge beam of the roof. The fascias allow you to create edges with an angle of 90 °. Because this is too sharp for the roofing, you put a wooden or plastic mastic scrap against the fascia that reduces the angle to 45 °. Nail or glue the mastic scrap to the fascia board with cold adhesive.

Roof against wall

If the roof surface runs into a wall, it is not possible to place a fascia. You must then use mastic scrap to reduce the angle from 90 ° to 45 °. Secure it to the wall. The bottom layer and the roof covering must then run up to 10 cm on the wall. When finishing, place a lead flashing or an aluminum compression strip (also known as a wall connection profile) over the edge of the roof covering.

Apply underlay

Underlay

An underlay may only be installed in dry weather and at temperatures above 5 ° C (41°F ). View the method below.

The edges

First of all, the edges must be finished with strips of 1 meter. Overlap the strips by 15 cm and glue these parts together with a cold adhesive. Then secure the strips further with 20 mm roof nails on the fascia. Do this every 30 cm. Cut the strips for the inner and outer corners diagonally and glue them on.

Roof trimming

If all edges are provided with the underlay, you can place the aluminum roof trims on the fascias. Always start placing in one of the corners. Saw the roof trim so that it can be mitered. Work with 200 cm pieces and fix the roof trim every 40 cm with stainless screws. You should allow 2 mm clearance between the pieces, so that there is room for expansion.

The bottom layer
To fix the rest of the underlay on the roof surface, first roll out a track from the lowest point and the bilge. You roll the second job next to it. Make sure that the different strips overlap by 10 cm and are staggered. This way you finish the entire roof surface. The transverse seams should have an overlap of 15 cm. To finish the underlay waterproof, you glue all seams. Secure the underlay on the overlaps with 20 mm roof nails. Do this every 10 cm according to a zigzag pattern.

Apply top layer

Preparation

A top layer can be a slab or fire roof covering. The preparation consists of cutting the strips of the top layer to size and rolling these strips around a pipe. You start laying the top layer at the lowest point (water drainage) of the roof and from the bilge. You only finish the eaves at the end.

Placement

Lay the top layer in the same direction as the tracks of the bottom layer, but offset half a track. To achieve this, halve the first web width. The second lane is then again the normal roll width. Then overlap the adjacent track by 10 cm. Make sure that the cross seams are staggered and that you have an overlap of 15 cm.

Corrugated sheets

Corrugated sheets come in many shapes, colors and sizes. For example, on a shed, carport or wood storage place, corrugated sheets provide an easy to realize, waterproof roof finish. They are not suitable for covering homes. When using corrugated sheets, the slope must be at least 7 °. The method of attachment differs per type. Read the manual on the packaging carefully before starting the job. You determine the beam distances for the supporting structure on the basis of the slope. After the supporting construction is ready, you can attach the plates in the opposite direction of the wave. The corrugated sheets must overlap. The overlap (at least 1 wave in the width direction and 15 cm in the length direction) varies according to the slope, but should always rest on a beam.

Ventilation

For good ventilation it is necessary that the corrugated sheets are placed against the main wind direction. For a watertight finish of the corrugated sheets that run against a wall, provide the connection to the wall with sealing tape or lead.

To burn

Roll out the track halfway and only then start gluing the top layer with the help of a burner. Heat the roll evenly and over the full width to create a bitumen bead for the roll. Push the roller into this bead and press it firmly. Make sure – by pressing on – a new bitumen bead of approximately 1 cm is created on both sides of the roller. By burning a lane in two parts, you prevent the lane from being glued. When the roof surface is completely covered, cut strips for the edges. Note: Always place a fire extinguisher on the roof as a precaution.

To stick

Roll out the track halfway and only then start to glue the top layer using cold adhesive. The seams must be pressed extra firmly and leveled with a putty knife. By gluing a track in two parts, you prevent the track from being glued. When the roof surface is completely covered, cut strips for the edges. The substrate can now be smeared with cold adhesive. Apply the next strip with an overlap of 15 cm and last seal the groove of the roof trim with bituminous sealant.

Blow

Poor vapor distribution under the roof covering when covering on old, existing roofing can cause blisters or folds on the roof. These problems can be prevented by first pre-treating the underlayment over which the roof covering is applied with a primer layer and then partially sticking or burning the roof covering. The edges of the roof covering must be glued completely.

Liquid roof cover

If you want to cover the roof surface with liquid roofing, you must first apply a primer layer on the surface. For this you use a so-called lazy car or tractor. This also comes in handy if you are going to apply the liquid roofing yourself. The consumption per layer of liquid roofing is approximately 0.4 liters per m2. Allow the first layer of roofing to cure well before applying the second layer (curing takes approximately 24 hours). You can also apply the second and possibly third layer with the lazy car or tractor. Sprinkle slate over the top layer to make the roof UV-resistant.

Shingles

A roof with a slope of less than 15 ° is not suitable for shingles. Before attaching shingles to the roof, it is advisable to provide the roof surface with a bituminous underlay. Then apply roof repair paste where the foot shingle will be placed. Glue the foot shingle and nail each shingle with four 20 mm roof nails. Let the strip protrude 6 to 10 mm over the eaves. You start the first row of full shingles by placing a shingle on the side and bottom edge equal to the foot shingle. For the ridge strips, cut the tabs of the shingle apart. Place these strips over the ridge of the roof, so that the nails of the last row of shingles are covered.

Corrugated sheets

Corrugated sheets come in many shapes, colors and sizes. For example, on a shed, carport or wood storage place, corrugated sheets provide an easy to realize, waterproof roof finish. They are not suitable for covering homes. When using corrugated sheets, the slope must be at least 7 °. The method of attachment differs per type. Read the manual on the packaging carefully before starting the job. You determine the beam distances for the supporting structure on the basis of the slope. After the supporting construction is ready, you can attach the plates in the opposite direction of the wave. The corrugated sheets must overlap. The overlap (at least 1 wave in the width direction and 15 cm in the length direction) varies according to the slope, but should always rest on a beam.

Ventilation

For good ventilation it is necessary that the corrugated sheets are placed against the main wind direction. For a watertight finish of the corrugated sheets that run against a wall, provide the connection to the wall with sealing tape or lead.

Repair roof parts

Repair

If any part of a roof covered with bituminous roofing is to be repaired, first remove the roof trim. Then you clean the roof well. This also means that you have to remove the gravel that may be on the roof.

In places where the bitumen roof covering is broken, repair or remove the top layer and any underlayers. Then you apply a primer layer on the surface and when it is dry, the new top and bottom layer. If a part of a roof covered with liquid roofing needs to be repaired, you can start with roof repair paste. With this product you can easily repair minor damage, such as tears, cracks and blisters. See the packaging for the instructions for use.

Tips

Tip 1: Good burner

A hobby burner is not suitable for burning bitumen roofing materials. Use a propane burner to avoid annoyance. Note: pasting is safer than burning.

Tip 2: Prevent cracks

To prevent cracking on the seams of the roof trim, you can stick a strip of roofing with bituminous sealant or roof repair paste on the seams.

Tip 3: No bitumen on tar roof

Never repair a tar-based bitumen roof. Those two products do not tolerate each other.

Tip 4: Flammable foil

The film on fire rollers is intended to prevent sticking together in the packaging. You do not have to remove it: it burns during assembly.

Tip 5: Help tiles

The cold adhesive that you use when attaching adhesive rollers ensures that the bitumen layers melt together. This process is much better if you temporarily apply heavy weights, such as pavement tiles, to the roof covering.

Tip 6: Waterproof

For optimum water tightness, the shingles on the roof edge must also be secured with roof repair paste.

Tip 7: Everything on color

To avoid large color differences in a shingles roof, it is recommended to first mix the shingles together.