Two is better than one dead locks for wooden doors
Characteristically a night latch is a passive form of locking a door, It is only meant to act as keeping the door closed and to stop people just walking in, admit tingly manufactures Like Yale, Union Era and many others have taken the simple night latch to extremes and this can be found in the BS 3621 Yale Night Latch.
Bringing us back to the point the problem with having a single lock on a door allows the door to twist at the top and bottom. The twisting effect can exert more force on a single point lock fitted on a door, because then the force can be exerted slightly side ways on the bolt can make it fail prematurely.
This is why multipoint locks can have a distinct advantage over a night latch on a wooden door, as a brut force attack on a door with a multipoint lock distributes the force more evenly around the whole door and frame.
One may say, therefore, that UPVC and or composite doors has a distinct advantage over our traditional wooden doors here in the UK.
It is, however, my view that wooden doors have a whole host of advantages over other types of doors and more so if more locks are fitted as to simulate that of a multipoint lock.
We would always recommend (subject to the style of door) to have fitted two dead locks and one rim locks (if applicable) in the centre of the door. we would recommend that you split the door into thirds. Fit a dead lock one third up from the bottom and one third down from the top. Rely on the night latch in the middle.
This set up with the inherent strength of hard wood will give you security comparable to most forms of multipoint locks and in some cases far better.
To cap it off fit hinge bolts on the hinge side that are normally less than a tenner and you have a force to be reckoned with.
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