Well simple fix seems to be edit the init.lua
minetest.register_node('roof:tile_' .. color, {
description = color .. ' tile',
drawtype = 'raillike',
tile_images = {png,png,png,png},
inventory_image = png,
wield_image = png,
paramtype = 'light',
is_ground_content = true,
groups = {cracky=3},
walkable = true,
material = minetest.digprop_glasslike(0.5),
})
"Before you speak, ask yourself: Is it kind, is it true, is it necessary, does it improve upon the silence?"
My mods:
http://goo.gl/n4kpn(Currently Various, Industrial, Fakeblocks, Jail, MoarCraft, Christmas, Replicator, minetest dev installer for linux, bash mod installer, windows mod installer)