Hi Guys,
By the time I have the ballasting done the timber is encapsulated in cement.Also with the amount of drainage I don't enviseage any problems with frost. A waterproofing plasticiser in the cement also keeps water out. Anyway guys,did a wee bit landscaping in the "Y"this afternoon. beautifull warm day here. Anyway,all I did was mix up some crushed rock (same as I use for the ballast)with some compost to make a gritty mix for alpine plants, Edged the trackside with stones then filled in with the grit and compost mix.laid pea gravel over the top. Keeps weeds down and also helps to hold moisture and also stops the compost from getting splashed all over in heavy rain. Another tried and tested method that works well. DAVY