Month: January 2015


Re-render versus solid wall insulation

04 01/15
Re-render versus solid wall insulation

Re-render versus solid wall insulation

So a ques­tion we get asked a lot – do I sim­ply re-ren­der my home or do I get it insu­lated at the same time, so solid wall insu­la­tion plus a ren­der top­coat.

So firstly – what is render?

A ren­der is a pro­tec­tive cov­er­ing that is applied to the walls to pro­tect the under­ly­ing brick­work. It can also be done because it can improve the look of the prop­erty if done cor­rectly (i.e. some peo­ple pre­fer the ren­der look to the exposed brick­work).

The ren­der applied to prop­er­ties now is very dif­fer­ent to the cement ren­der that has his­tor­i­cally been applied to homes. These new ren­ders are flex­i­ble and strong and com­pletely water tight – this means they move with the build­ing and there­fore don’t crack over time, mean­ing you get a long last­ing, main­te­nance free pro­tec­tive layer on the out­side of your home.

What is solid wall insulation?

The only real dif­fer­ence is that with Solid wall insu­la­tion, we also add a layer of insu­la­tion under the ren­der. We tend to rec­om­mend adding 100mm of EPS insu­la­tion board since this really makes a dif­fer­ence in terms of ther­mal per­for­mance – tak­ing the u-value of the wall down to less than 0.3w/m²k – which is bet­ter than cur­rent build­ing reg­u­la­tions.

The cost difference between just render and solid wall insulation

The price to get your home re-ren­dered (or ren­dered for the first time) is a lit­tle depen­dant on whether the under­ly­ing ren­der needs to be removed – this will be the case unless it is struc­turally sound, because we can’t anchor our ren­der on an unsta­ble mate­r­ial – it just won’t last.
If you need to remove the exist­ing ren­der you are look­ing at a price of approx­i­mately £70 per metre squared. If you can put our ren­der straight on the wall with­out remov­ing the exist­ing ren­der (because it is strong enough) then the cost comes down to approx­i­mately £55 / m².

These num­bers are exclu­sive of VAT – which in the case of re-ren­der­ing a prop­erty is charged at 20%. This price should also cover scaf­fold­ing costs except in excep­tional cir­cum­stances!