Newbie question on identifying upstairs floor type

Hi all,
First post so be gentle-found the forum via google.Been browsing the articles for a few hours and decided to join.Like to do a bit of DIY and gardening as my job is broadband (I work for a large cable TV company) and hammering things helps me to get away from IP address's and slow speed complaints
My question is, we are looking at floor tiling the upstairs bathroom-I know, there is a tiling forum but I thought it best to ask in here.
I want to identify what my flooring is-the house is new, it was built 3 years ago by McLean/George wimpey. The flooring is of a wood type, it is T & G, that I'm certain. I think it is directly nailed/screwed onto the joists and when I've pulled the carpets up, it has a green, sort of waxy covering on it. If it helps, it seems a bit more sunstanial than the T & G chipboard I put in the loft to sit some of my rubbish on.
Can somebody hazard a guess at what it is, then I can look through the forums and decide how it should be prepared before I put/get someone to put my porcelain floor tiles down

Thanks

Cab

Probably green TG4 chipboard http://www.egger.com/co-uk-eng/egger-co-uk-products-flooring-boards_14741.htm but not necessarily weyroc.
Widely used by builders large and small

Read the stickies in the tiling forum, they are gonna tell you to rip up the chipboard and lay plywood instead. or something.

Deluks said:

Read the stickies in the tiling forum, they are gonna tell you to rip up the chipboard and lay plywood instead. or something.

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Sounds like that is the stuff-cheers. Read some of the stickies last night, hence the question
I suppose its down to the fact that this chipboard, even the 22mm stuff, is considered too flexible and over time, the "springiness" of the board will lead to movement of the tiles/cracking of the grout? Have I got this right?

Cheers

No, mainly that chipboard, if it gets wet, will swell up and basically disintigrate. Even the water resistant/moisture resistant P5 stuff won't stand up to a soaking. It'll only take one overflowing bath/sink, rad leak or damaged pipe under the floor and you'll have to redo the lot. Wbp ply is much more forgiving to water contact.

Deluks said:

No, mainly that chipboard, if it gets wet, will swell up and basically disintigrate. Even the water resistant/moisture resistant P5 stuff won't stand up to a soaking. It'll only take one overflowing bath/sink, rad leak or damaged pipe under the floor and you'll have to redo the lot. Wbp ply is much more forgiving to water contact.

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Ahh-ta for that. I've got twins so water dispersion is a usual thing

denso13 said:

Probably green TG4 chipboard http://www.egger.com/co-uk-eng/egger-co-uk-products-flooring-boards_14741.htm but not necessarily weyroc.
Widely used by builders large and small

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Denso13 what does TG4 stand for?

Chipboard basically