GINA'S SHED, RAISED BEDS AND WALLS FROM NEW PINE RAILWAY SLEEPERS

Following a significant landscaping of our garden using lots of new railway sleepers (all good!), we have built a shed to complement it also with railway sleepers under a mono pitch roof. Looks great. The  railway sleepers are horizontally laid, staggered joints and taller than wide with mastic between them to help seal. However, water is still coming in so we need a waterproofing solution - preferably one that isn’t going to affect appearance. That is, we are considering cladding with featherboarding but I’m not at all keen. Can you suggest anything for us please? The problem is rain blowing in, not it rising from the floor. Many thanks 
Gina

RAILWAY SLEEPERS USED:
New British pine railway sleepers

RailwaySleepers.com Says..

RailwaySleepers.com supplies new and used hardwood & softwood railway sleepers throughout the UK. Railwaysleepers.com
A wonderful range of landscaping creations with railway sleepers, that highlight the different levels in your garden to great effect. The solid railway sleeper shed is a natural addition that blends perfectly with the other structures. It's a shame that you have some leaking problems. Normally this is because new railway sleepers shrink as they dry out, creating slight gaps that windblown rain can seap through. It would be a shame to have to overclad the railway sleepers with other timber, so I hope you find some way of using mastic sealant to deal with those leaks, so you can see the railway sleepers in all their glory!