Knowledgebase: Metal Sheds
Water Leaks and some solutions on Yardmaster sheds
Posted by on 29 August 2013 03:13 PM

Many thousands of Yardmaster sheds are sold throughout the UK, Ireland and mainland Europe each year. It is important therefore that these products are fit for the purpose one would expect from a garden shed.

When a Yardmaster building is assembled in accordance with the ASSEMBLY INSTRUCTIONS and good DIY practice, it will remain free from water penetration.


If you should find evidence of water coming into your shed and you are sure condensation is not its source, the cause may be one or a combination of the following:



Reason 1.

 Plastic/Fibre washers have not been used under the heads of the self tapping screws when fixing wall and roof panels to the framework of the shed.



Always use the proper Plastic/Fibre washers included in the kit of parts.


The purpose of the washers is to seal the screw holes. When a panel is screwed to the framework, the hole in the framework which holds the screw is 3 mm. in diameter, the clearance hole in the panel through which the screw passes, is 7mm in diameter. It is important that the larger clearance hole is completely covered by the washer to seal the hole and prevent leaks. Note: The hole sizes quoted above are standard on all fixings using self tapping screws.




Reason 2.

The self tapping screws have not been fixed square to the panels being fixed. When a screw is fixed at an angle, water can leak under the washer because it is not flat against the panel and therefore does not cover the larger clearance hole.


When fixing the panels in place always ensure that holes are in line with each other. le The hole in the framework can be seen when looking through the larger hole in the panel. i.e. When hole alignment is correct, the screw can be fitted square to the flat surface of the panel, allowing the scaling washer to cover the larger hole.


Reason 3.

The Plastic/Fibre washer does not cover the larger hole in the panel.


See solution as 2 above. i.e. Ensure hole alignment is correct, to have larger hole scaled by the washer. 



Reason 4.

Self tapping screws are OVER or UNDER torqued. (tightened) 




Use of a cordless drilling machine can be used to drive the self tapping screws, but

care should be taken to set the torque, usually around a setting of 1 or 2 on a 13 V

machine. Speed should be set at low. ( 1 on a 2 speed machine)

When using a manual screwdriver tighten slowly and when the screw begins to

tighten, apply enough torque to give a further 1/4 to 1/2 turn.


General Note:

When assembling panels to framework DO NOT start at one corner and tighten each screw on the panel before presenting the second panel. It is best to fix all the panels loosely and then tighten the screws when the building is square. (i.e. The panels are fitted square to the framework and all holes are correctly aligned.)



Reason. 5.

 The translucent roof panels (if supplied with your model) have been cracked when screwing in place.



When fitting the translucent roof panels (if supplied with your model) drill the screw holes after marking the hole positions through the panel holes. DO NOT use the self tapping screw to make a hole in the translucent panel by forcing the screw. This can crack the translucent material.



Reason 6.

The translucent roof panels (if supplied) are fitted on top of the adjoining metal panels. Experience shows it best to fit the translucent panels under the adjoining metal panels.



We recommend when fitting the translucent panels (if supplied), to place them UNDER the adjoining metal panels.



Reason 7.

The base of the shed is uneven, allowing water to run into the shed under the base rails.



 Due to an uneven surface there may be some seepage of water under the base rails. This can be eradicated by sealing around the point where the base rail sits on the concrete base, a  SILICON mastic can be used for this. An application around the outside is usually sufficient.



Reason 8.

 The sitting of the shed allows high winds to blow rainwater under the gutter edge and/or under the ridge covers.



 Give your shed as much protection from prevailing winds as possible. The gaps at the gutters and ridge covers provide ventilation and should not be blocked, if at all possible.



Reason 9.

 Poor joints at panel overlaps can allow water to penetrate the shed.



Make sure panel overlaps are tight to stop water being blown under the panel. 



Reason 10.

If the shed has not been assembled in accordance with the assembly instructions, leaks can occur when assembly is complete.



The initial stages of shed assembly will determine the success or otherwise of the assembly process. Double check the base for squareness and ensure the corner panels/posts are square to the base. Fit all panels loosely and tighten only when all panels are in position and square.



Reason 11.

Finally, check again that condensation is not forming when temperature is subject to sudden changes, giving the impression of roof leaks. If you need more information on condensation ask for a " CONDENSATION " sheet by telephoning: 028 7962 8270. and ask for Customer Service.

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