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Mercia Garden Overlap Apex Shed 01OVLPA1008DDFW-V1, 01OVLPA1008DDFW-V1-NW Manual

Mercia Garden Overlap Apex Shed 01OVLPA1008DDFW-V1, 01OVLPA1008DDFW-V1-NW Manual Image
Mercia Garden Overlap Apex Shed Instruction Manual


– Check the pack and make sure you have all the parts listed.
– When you are ready to start, make sure you have the right tools at hand (not supplied) including a Phillips screwdriver, Stanley knife, wood saw, step ladder and drill with 2mm bit.
– Ensure there is plenty of space and a clean dry area for assembly.


As with all natural materials, timber can be affected during various weather conditions. For the duration of heavy or extended periods of rain, swelling of the wood panels may occur. Warping of the wood may also occur during excessive dry spells due to an interior moisture loss. Unfortunately, these processes cannot be avoided but can be helped. It is suggested that the outdoor building is sprayed with water during extended periods of warm sunshine and sheltered as much as possible during rain or snow.

Once your garden building has been installed it will need to be treated as soon as possible and annually to prevent the timber from deteriorating and to waterproof it. This is required to maintain the anti-rot guarantee.

Dip Treated buildings – Require a preservative treatment to protect against rot and decay and a waterproof treatment to prevent water ingress
Pressure Treated buildings – Require a waterproof treatment to prevent water ingress

Log Cabins – Are supplied untreated and require a preservative and waterproofing treatment.


When thinking about where the building and base is going to be constructed: Ensure that there will be access to all sides for maintenance work and annual treatment.

Ensure the base is level and is built on firm ground, to prevent distortion. Refer to diagrams for the base dimensions, The base should be slightly smaller than the external measurement of the building, i.e. The cladding should overlap the base, creating a run off for water. It is also recommended that the floor be at least 25mm above the surrounding ground level to avoid flooding.


– Concrete 75mm laid on top of 75mm hard-core.
– Slabs laid on 50mm of sharp sand.

Whilst all products manufactured are made to the highest standards of Safety and in the case of children’s products independently tested to EN71 level, we cannot accept responsibility for your safety whilst erecting or using this product.

Refer to the instructions pages for you specific product code

Please retain product label and instructions for future reference

All building’s should be erected by two adults

Winter = High Moisture = Expansion
Summer = Low Moisture = Contraction

For ease of assembly, you MUST pilot drill all screw holes and ensure all screw heads are countersunk.

CAUTION Every effort has been made during the manufacturing process to eliminate the prospect of splinters on rough surfaces of the timber. You are strongly advised to wear gloves when working with or handling rough sawn timber.

** Protim Aquatan T5 (621)**
Your building has been treated with Aquatan.

Aquatan is a water-based concentrate which is diluted with water, the building as been treated by the correct application of Aquatan solution and then allowed to dry.

Aquatan is a decorative finish to color the wood, which is applied industrially to timber fence panels and garden buildings.

Aquatan undiluted contains: boric acid, sodium hydroxide 32% solution, aqueous mixture of sodium dioctyl sulphosuccinate and alcohols: 2, 4, 6-trichlorophenol.


Overall Dimensions:
Length = 3028mm
Width = 2484mm
Height = 2121mm
Base Dimensions:
Length = 3016mm
Width = 2414mm

Building Content:

Nail Bag

Pre Assembly
Remove transportation blocks from the bottom of each panel before beginning assembly. Each Panel should have two blocks.

Fix the T Hinges onto the doors and door frame as shown. Ensure that the screws go through the cladding and into the framing behind.
28x30mm screws

Step 1

Place floor on firm and level base, ensure base has suitable drainage free from areas where water can collect. (See front page on base requirements).
Attach the floors using 12 x 40mm screws 12x40mm screws

Step 2

(a) Fix the corners with 50mm screws as shown in diagram.

Position the panels so there is equal spacing between the floor and cladding on all 4 sides

Step 3

Fix the remaining plain side and a window side at the corners with 50mm screws as shown in diagram.

Step 4

Fix the remaining window side and the door gable at the corners with 50mm screws as shown in diagram.

Step 5

Ridge Bar Assembly

Position the two parts of the ridge bar within the `U’ channel and secure from either side with 3 x 30mm screws and 4 x 30mm screws from underneath. Secure an `L’ bracket to either end of the ridge bar using 2 x 30mm screws per bracket. Place the roof support bar in between the front and back panels.
Ensure the top corners of the support bar are flush with each top point. Secure in place using the L Bracket on each end with 4x30mm screws.

Step 6

i)Position a truss frame to the ridge bar sloping down towards the building side, ensure it is central to the middle upright of the panel. Fix with a 50mm screw through the ridge bar into the truss frame.

ii) Align the second truss frame with the trust on the opposite side of the ridge bar and fix with a 50mm screw at an angle as illustrated.

Step 7
i) Fix the truss block to the side panel framing with 2 x 50mm screws. Position the block at the top of the framing with the angle pointing upwards into the building, aligning the block centrally along the join between the side panels with one screw in each panel.
ii) Fix the support bar to the block using 1 x 50mm screw.

Step 8

Fix a Truss support between the two truss frames and fix in place using 40mm screws, ensure you pre-drill holes before fixing together.

Step 9
(a) Place two roof sheets on top of the plain gable and truss making sure the roof sheet sits flush to the outside edge of the plain gable and fix using 40mm screws. Before fixing the roof sheet to the truss frame make sure the edge of the roof sheet sits in the middle of the truss frame then fix using 40mm screws.
20x40mm Screws
(b) Fix the eaves frame to the roof sheet using 3x30mm screws for each sheet. 6x30mm Screws

Step 10
Attach another truss in the center of the building the same way as shown in step 6 through to 8.
8x50mm Screws
4x40mm Screws

Step 11
Attach another two roof sheets on top of the two truss’s in the same way as stated in step 9a ensuring that the roof sheets sits half way onto each truss frame. 20x40mm Screws

Attach another two roof sheets on top of the two truss’s in the same way as stated in step 9a ensuring that the roof sheets sits half way onto each truss frame.

Attach another roof sheet on top of the truss in the same way as stated in step 9a using 20x40mm screws.
Then fix the eaves frame to the roof using 3x30mm screws on each eave.

Step 12
Once the roof is fixed attach the building to the floor with 50 mm screws.

Step 13 
Cut out three strips of 3204mm felt and place onto the roof.
Place the felt flat onto the roof in the order that is stated on the diagram below.
Once the sheets are laid out fix them onto the roof with tacks 100mm apart.

Step 14

Fit the cover trims to the building and secure in place with 40mm screws as shown. Pre drill to avoid splitting.
18x40mm Screws

Step 15
Attach fiasco’s to the roof leaving a slight overhang at the top..
Fit the fascia’s to the roof over the felt and secure in place with 40mm screws as shown. Pre drill to avoid splitting.

(a) First line up the door blocks on top of the framing of the doors. Then fix with 2x30mm screws by screwing through the matchboard door into the block. 6x30mm Screws

(b) Use 4x30mm Screws to fix each beading strip onto the door gable. Ensure that the screw is parallel with the door frame when fixing the strip to the door gable as shown in the close up view.
8x30mm Screws

(c) Attach the turn button to the top and bottom door blocks with 1x30mm screw for each one. 2x30mm Black Screws

Step 16
(a) Fix the door strips to the master door using 5x30mm screws. If the strips are attached to the slave door the doors will not open properly. 5x30mm Screws

(b) Use 1x30mm screw to secure the turn button to the master door. 1x30mm Black Screws

Step 17

Fix the window strips to the two pieces of framing that sit alongside the outside edges of the window with 3x30mm screws for each strip.
6x30mm Screws

Fit the styrene sheets on top of the window chill.
When positioning the styrene sheets ensure there is an equal distance between them and at either side of the windows.

Attach the three window strips at either side of the windows using 3x30mm screws each. Make sure the screws enter the framing in the window panel and not the styrene.
9x30mm Screws

For assistance please contact customer care on: 01636 880514
Mercia Garden Products Limited,
Sutton On Trent,
NG23 6QN